Cryptocurrency donations for bots, groups and channels
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…
Nope.
Only e-mail.
And that's an example. There are many more sites just like that one.
First of all, emails become less and less popular.
Also, in my opinion, there's no point of implementing an email feature in an app that has a faster and more secured messaging technology, that is MTProto.
The only point may be getting confirmation codes for services, as mentioned above, but most of the popular services support registration by phone number (which is far more comfortable) or, why not, Google.
By the way, cool mockups. 👍
example: @fakemailbot