It has nothing to do with ordinary sorts of “bad” content either like hate speech or crypto scams or whatever. All of that can be found in abundance in many places, all of which are still online.
This is about something else. Note the standard cast of characters with certain well known alignments rushing out to defend him.
My top guess is direct involvement in scams, money laundering, CSAM, etc. I mean direct participation, not just running a chat used by others for these things.
My second guess is the upcoming election. Telegram was a big vector for coordinating the January 6th riots. Maybe there’s a network being taken down here.
Don’t know, will have to wait and see.