Telegram deleting messages appear to work for me. Likely this guy is just buying into Signal FUD that Telegram is somehow worse encryption, despite Signal's encryption being used by Facebook and funded by the US Govt.
For all practical purposes, Signal's backend is also closed source. The public repository for the server code hasn't been updated since April 2020 (nearing a year now) though Signal has, in the meantime, come up with features like new groups that necessitate storing more metadata on its servers.
What does using the same encryption algorithms of a government or business have to do with the conversation? Are you implying that the algorithm is unknowingly back-doored, with the evidence being that Facebook uses the same algorithm? Or am I misunderstanding your point?
