Set up a system where you need to have
A: An account here over a certain age
B: A reasonably high bar of activity where it can be ascertained if the account is acting in good faith.
Imo the reasoning for doing this is a noble one but its very very open to being exploited unfortunately.
I think Pavel getting a stale baguette shoved up his behind has truly rendered Telegram compromised in more way than one... I'd be highly cautious of using it for anything at this stage.