It's really nice of m0xie & Signal to make work on SGX exploitations more attractive. ¯\_(ツ)_/¯
Especially if, in a closed ecosystem, you could implement something like GNU Taler to handle user to user transactions and anonymise them in front of a backend payment provider.
The social network of the future: No ads, no corporate surveillance, ethical design, and decentralization! Own your data with Mastodon!