Sticker repository? lol, Telegram has that market cornered and you know it :)
https://matrix.org/ is probably the only reasonable solution to your problem but reading between the lines you're inferring that Telegram is dead in the water.
I'm a popcorn fanantic and await to see the, corns?
No doubt, and I would really love someone with more knowledge than me to poke into why that was going on (*edit: for clarity, this behaviour stopped after installing OpenWRT and is the stock Mi firmware that causes this)
https://files.catbox.moe/2i5ekl.jpg
I remember finding this thread where someone said they replaced their entire networking equipment
https://stackoverflow.com/questions/72022569/cannot-find-fixes-to-apt-error-hash-sum-mismatch
My router is this model for anyone wanting to nosey
https://openwrt.org/toh/xiaomi/ax3600