Distracting from Telegram’s own issues?
Durov gives the impression of getting his information from a City Journal report, which Dorsey shared on X.
The article states that insiders have argued OTF and the US intelligence community have a close relationship.

Elon Musk seemed to be on the side of Telegram in this fight.
Readers have added context notes warning that there is no evidence of this.
There are known vulnerabilities with Signal that are not being addressed.
Telegram by contrast does not end-to-end encrypt conversations by default.
Given who uses Telegram, this server is probably a magnet for intelligence services.
Telegram isn’t a secure messenger, full stop."