I just donated to Signal after seeing the error banner in the app. I realised I was more than happy to pay WhatsApp's yearly charge back in the pre-Facebook days (think it was 70p or so?). Figured I could give Signal a few quid every now and then, maybe keep a server up for a few seconds :) Donation link should anyone be interested: https://signal.org/donate/
edit : which presumably drives licensing income from Microsoft to The Signal Foundation, which I am presuming is better than nothing and if like me you can start using Signal protocol for calling your family elders via Skype without friction, and I simultaneously create widespread adoption of the Signal protocol, I can't see any downside myself anyhow.
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