"No FX rate available". Add text [*Tor Not Working] to FX providers that don't allow tor connections (Tor, VPN, proxy, banned, disallowed, exchange rate, currency conversion, fiat, USD/EUR)

Recently, 3 out of the 4 currency converters contained within Electrum have stopped allowing Tor & VPN connections, and therefore I’m proposing they should be removed as choices.

Here are the logs showing unsuccessful attempts to change configurations.

CoinGecko: NO LONGER ALLOWS TOR CONNECTIONS:

20201116T233657.155142Z |     INFO | exchange_rate.CoinGecko | failed fx history: ClientResponseError(RequestInfo(url=URL('https://api.coingecko.com/api/v3/coins/bitcoin/market_chart?vs_currency=NZD&days=max'), method='GET', headers=<CIMultiDictProxy('Host': 'api.coingecko.com', 'User-Agent': 'Electrum', 'Accept': '*/*', 'Accept-Encoding': 'gzip, deflate')>, real_url=URL('https://api.coingecko.com/api/v3/coins/bitcoin/market_chart?vs_currency=NZD&days=max')), (), status=403, message='Forbidden', headers=<CIMultiDictProxy('Date': 'Mon, 16 Nov 2020 23:36:56 GMT', 'Content-Type': 'text/html; charset=UTF-8', 'Transfer-Encoding': 'chunked', 'Connection': 'close', 'CF-Chl-Bypass': '1', 'Set-Cookie': '__cfduid=dd51654833fe1e827e79ea235e6b144c61605569816; expires=Wed, 16-Dec-20 23:36:56 GMT; path=/; domain=.coingecko.com; HttpOnly; SameSite=Lax', 'Cache-Control': 'private, max-age=0, no-store, no-cache, must-revalidate, post-check=0, pre-check=0', 'Expires': 'Thu, 01 Jan 1970 00:00:01 GMT', 'X-Frame-Options': 'SAMEORIGIN', 'cf-request-id': '06750441830000178a6bbc2000000001', 'Expect-CT': 'max-age=604800, report-uri="https://report-uri.cloudflare.com/cdn-cgi/beacon/expect-ct"', 'Vary': 'Accept-Encoding', 'Server': 'cloudflare', 'CF-RAY': '5f35097c0f8e178a-FRA', 'Content-Encoding': 'gzip')>)

BitcoinVenezuela: NO LONGER ALLOWS TOR CONNECTIONS:
20201116T233709.982996Z |     INFO | exchange_rate.BitcoinVenezuela | failed fx quotes: ClientResponseError(RequestInfo(url=URL('https://api.bitcoinvenezuela.com/'), method='GET', headers=<CIMultiDictProxy('Host': 'api.bitcoinvenezuela.com', 'User-Agent': 'Electrum', 'Accept': '*/*', 'Accept-Encoding': 'gzip, deflate')>, real_url=URL('https://api.bitcoinvenezuela.com/')), (), status=403, message='Forbidden', headers=<CIMultiDictProxy('Date': 'Mon, 16 Nov 2020 23:37:09 GMT', 'Content-Type': 'text/html; charset=UTF-8', 'Transfer-Encoding': 'chunked', 'Connection': 'close', 'Set-Cookie': '__cfduid=dd0a83f76002890de97506408823f0d181605569829; expires=Wed, 16-Dec-20 23:37:09 GMT; path=/; domain=.bitcoinvenezuela.com; HttpOnly; SameSite=Lax; Secure', 'CF-Chl-Bypass': '1', 'Cache-Control': 'private, max-age=0, no-store, no-cache, must-revalidate, post-check=0, pre-check=0', 'Expires': 'Thu, 01 Jan 1970 00:00:01 GMT', 'X-Frame-Options': 'SAMEORIGIN', 'cf-request-id': '06750473c70000fc59699ec000000001', 'Expect-CT': 'max-age=604800, report-uri="https://report-uri.cloudflare.com/cdn-cgi/beacon/expect-ct"', 'Report-To': '{"endpoints":[{"url":"https:\\/\\/a.nel.cloudflare.com\\/report?s=xhPZRFXZal%2F%2FePswbu%2F39B9aj5%2BDhkH2TQ78F9Ce%2BTIUm%2F2jsKbogcycEvrrw05nZBxuUzhIMNmcDwa0z2d4UWUniNN%2BJIE1AU2F0TSXdZbHrseNiVRFwLI%3D"}],"group":"cf-nel","max_age":604800}', 'NEL': '{"report_to":"cf-nel","max_age":604800}', 'Vary': 'Accept-Encoding', 'Server': 'cloudflare', 'CF-RAY': '5f3509cc79e1fc59-ZAG', 'Content-Encoding': 'gzip')>)

CoinCap: NO LONGER ALLOWS TOR CONNECTIONS:
20201116T233719.334200Z |     INFO | exchange_rate.CoinCap | failed fx quotes: ClientResponseError(RequestInfo(url=URL('https://api.coincap.io/v2/rates/bitcoin/'), method='GET', headers=<CIMultiDictProxy('Host': 'api.coincap.io', 'User-Agent': 'Electrum', 'Accept': '*/*', 'Accept-Encoding': 'gzip, deflate')>, real_url=URL('https://api.coincap.io/v2/rates/bitcoin/')), (), status=403, message='Forbidden', headers=<CIMultiDictProxy('Date': 'Mon, 16 Nov 2020 23:37:19 GMT', 'Content-Type': 'text/html; charset=UTF-8', 'Transfer-Encoding': 'chunked', 'Connection': 'close', 'Set-Cookie': '__cfduid=d16678194a13d4f75e3e87f9e63a5df561605569839; expires=Wed, 16-Dec-20 23:37:19 GMT; path=/; domain=.coincap.io; HttpOnly; SameSite=Lax', 'Cache-Control': 'private, max-age=0, no-store, no-cache, must-revalidate, post-check=0, pre-check=0', 'Expires': 'Thu, 01 Jan 1970 00:00:01 GMT', 'X-Frame-Options': 'SAMEORIGIN', 'cf-request-id': '067504984f00001f3d00b1c000000001', 'Expect-CT': 'max-age=604800, report-uri="https://report-uri.cloudflare.com/cdn-cgi/beacon/expect-ct"', 'Vary': 'Accept-Encoding', 'Server': 'cloudflare', 'CF-RAY': '5f350a06df471f3d-FRA', 'Content-Encoding': 'gzip')>)

CoinDesk: STILL ALLOWS TOR CONNECTIONS:
20201116T233733.494979Z |     INFO | exchange_rate.CoinDesk | getting fx quotes for USD
20201116T233734.623428Z |     INFO | exchange_rate.CoinDesk | received fx quotes

[SomberNight]

Sure. Maybe the code could be made aware of this somehow; not sure exactly how though. Perhaps we could add a boolean property to each exchange for Tor-friendliness and allow to filter for that.

[SomberNight]

Indeed many exchange rate providers ban Tor exit node IPs. I share your views and think it is a shame. On the other hand, there are not many providers that provide historical conversion rates at all, and these work just fine for many people over clearnet, so we should not simply remove them completely. Instead of removing providers that ban Tor/VPNs, we should add new ones that do not.