I donated, and planned to continue yearly, but then they added a cryptocurrency in a very obvious pump and dump scam — MobileCoin; brand new, untested, for-profit startup owned, VC funded, in which the Signal CEO was an adviser and potential investor, with all "coins" privately pre-sold to VC's and other investors.

I haven't recommended Signal since, and refuse to donate until that shit is removed.

IMO Signal should only be seen as temporary until a stronger competitor is built. Being centralised and US based is a deal breaker, long term. The permanent communication service, that humanity should ultimately rely on, must be completely decentralised and capable of transacting via a client-based P2P mesh network, that is independent of commercial internet infrastructure... e.g. it can continue operating phone to phone, router to router, etc, using wifi/bluetooth if the internet is cut, whether by government action or natural disaster.