I suggested about six months ago that Signal should have its own ICO/cryptocurrency. Good way to get an open source project funded. Look at Brave, IPFS, and others.
I would be willing to contribute a lot if signal could even reach half the usability level of telegram. Signal is losing many users to telegram because of UI/UX.
[0] https://news.ycombinator.com/item?id=15935583
[1] https://www.mobilecoin.com/whitepaper-en.pdf