Telegram has probably sufficient money, so that threatening them into doing what FB/Meta wants does not work. They only go after small enough fish, preying on the weaker.
Not sure I want to post my domain but a bit of research will get you there if you want to confirm it. An Austrian news outlet wrote about the threat when I was involved.
https://www.theguardian.com/media-network/2016/dec/02/battle...
I don’t see how even Facebook could have an issue with “telegram” being used commercially, but I wouldn’t be totally surprised if they did.