I've heard criticisms about Telegram's MTProto encryption on HN, but in my usage of Telegram nobody has ever turned on the secret chats mode enabling it anyway. Anyone privacy-conscious asks me to use Signal, Matrix, or even Threema.
I have heard compliments about Telegram sticker packs though, if the other apps want more users they could consider making "cute stickers" :)
You joke, but Telegram's clients have been innovating for years. Way ahead of the rest. Its packed with features and yet never feels bloated or slow. Frankly, its amazing.
The Telegram client/feature set is great, and I hope Signal and competitors will improve their clients to match.
Many of Signal's sticker packs were ported from Telegram:
https://core.telegram.org/stickers#importing-stickers-from-o...
In light of that, importing stickers from Telegram to other apps is fair game. Telegram's very brief terms of service* do not forbid users from using Telegram stickers outside of Telegram.
Also, some of these stickers are recycled memes from social media and pop culture, which usually qualify for fair use when used for messaging.
https://tlgrm.eu/stickers/MrBat https://tlgrm.eu/stickers/BattyBat https://tlgrm.eu/stickers/FangBat