>If anyone from WhatsApp/Telegram/Signal/etc is reading this, I would pay a lot for a "Pro" account to have high-res photo uploads for my wedding/music festival/travel/etc group chats
Doesn't Telegram allow full-resolution sharing of pictures out of the box ?
Unfortunately, you'll probably get people sharing whichever way they're most comfortable with and have to ask them specifically for originals.
Telegram does allow sharing full-res (both photos and videos)... but you're at the mercy of the end user to select that option at upload time, and I'm not confident this is reasonable.
Telegram does intact have "lossless" image transfer.. might not be suitable on a mobile device though with space considerations and lack of cloud sync by design.
Doesn't Telegram allow full-resolution sharing of pictures out of the box ?
Unfortunately, you'll probably get people sharing whichever way they're most comfortable with and have to ask them specifically for originals.