Well, the internet never forgets. Jokes aside, it seems like the deletion activity didn't federate with my instance in time so when I wrote my initial comment, I was still able to see it. (though it does not matter if it was deleted or not, instance admins can still see them).
If I am being honest, Mbin/Kbin's concept is much better than Lemmy. I like how you can microblog and just use it like a normal forum, which means you can interact with even more people since microblogs (from Mastodon, for example) don't really federate with Lemmy. I'd like to use Mbin, but there is no real useful android app for it yet (yes I know Interstellar exists, but it isn't very featureful yet).
As an instance admin, you can see who voted what. Moderators are also able to view votes in their community. See discussion regarding vote privacy here: https://github.com/LemmyNet/lemmy/issues/4967
Telegram's secret chat's encryption algorithm is made by Telegram themselves, which is already a red flag. You generally don't want to roll out your own encryption algorithm if you aren't cryptographers, which Telegram people aren't. Their MTProto is also not proven, so you'd rather not want to use it.
Why the repost?