The US State Dept. almost certainly had a significant role in this. What comes next for Telegram and it's users is not going to be pretty. I expect the exodus to other platforms has already started. Make no mistake this was a blow targeted at Russia.
https://x.com/MikeBenzCyber/status/1827628591560925550
FOSS isn't the most polished software at all times, but as long as there's a CEO there's a single guy you can take down, but you can never fully destroy a distributed network. Witness Napster and megaupload vs. BitTorrent.
Is Telegram distributed? I didn't think it was, but don't really know. I preference peer to peer as much as possible.