With the amount of known use of Telegram by unsavory actors, combined with Durov's own leveraging of his platform for activism, I've been using Whatsapp more and more lately, and don't feel bad about that.
I respect Signal, but it's missing too many product features and it doesn't have the reach Whatsapp does, so it's not compelling as a switching option at this point, even for family use.
Can you point at anything in his message that's not factually correct?
He also got involved in Romanian and Moldovan elections, by sending a message to target users in the day of the elections( when doing campaign is illegal) with claims he presented no evidence for, basically the bastard works for Ruzzia, he might be forced to but the facts do not lie.
Otherwise, the "doomer manifest" is OK, but the comically inflated ego of Durov is annoying, him thinking that such banal and commonplace sentiments are worth pushing as an alert message to all users, wrapping everything into announcing his birthday (that he doesn't want to celebrate, oh no).