I mean we already have this forum so why would we need a telegram group.
If Telegram had been around I see no reason why Satoshi would've used it. It's a fucking useless resource for preserving discussion. I don't understand why it's become so ubiquitous in a space that should be providing discourse to refer to months or years down the line.
nowadays in the cryptocurrency market there are lots of shitcoins that use Telegram because it is easy to advertise their junk to newbies who follow them and create bots that spam it for them automatically. it is also easy to censor it and a lot more that helps all of these pumps, ICO scams,... do their filthy work and reach a very large number of people at once. that is why it has become popular at least in this space.