@nprofile1q... AFAIU that validation is when uploading a new sticker, not when using an already-defined one.
> everything you say or send on Telegram goes trough their servers in plain text
where did they say that?
Also AFAIK they only ever claimed that the special "secret chat" mode that nobody uses is end-to-end encrypted, the regular chats were never claimed to be end-to-end encrypted, so obviously the server had access to it...
But that's neither news nor RCE.