Show a button for sending quick donations to maintainers of bots, groups or channels using cryptocurrency. This could use either an established cryptocurrency like Bitcoin, Etherium, EOS, etc. – or some version of TON, like Free TON etc.
Looks like a fantastic idea to me, can't wait to see it!
I would suggest any type of donation, not just cryptocurrency. I would also like to donate to Telegram owners.
I like your idea.
The donation button would also be useful as a payment method for products sold through bot stores, I would suggest more commercial features added to the bot api, Telegram should charge its interest though which is also a good point