They had their chance to win my confidence. When Telegram was released, many people said "this looks weird in so many ways. You should really dump that and rewrite it to rely on well-understood primitives" to which the telegram devs answered rather mockingly and started a bullshit crypto contest.

6 months later, a russian guy showed that the server could MITM every newly started or renegotiated secret chat.

Sure, they manned up to their promises and gave him something like $80k, but it is a rather telling story about how good they are at crypto.

Their crypto today? Yup, still weird.