[71bw]

>While Discord Inc. is based in San Francisco, Tencent (China) owns Discord

Good to know it's yet another one in the never-ending Tencent spectrum.

>Telegram seems to be mostly on the Open Web, even providing an interface to be crawled ?

Theoretically yes, but in practice I've found it only works good with big (as in, popular - with a lot of members) channels, and even then history is wonky and you can't grab files without an account. Pictures do work fine, videos don't AFAIR.