I've seen a few messages this morning recommending people switch to #Signal to protect themselves.

I would recommend an alternative: Switch to #Matrix (at matrix.org), and join its foundation.

It doesn't have the same reach as Signal (and some would say it's not as mature, but I would debate that!), but it does one thing that Signal doesn't: you can join a Matrix node (i.e. "Homeserver") that is independent of all other Matrix nodes, and still be a part of the greater Matrix federation.

It's possible to spin up a Signal server, but -- as far as I understand it -- you can't use it to communicate with others on the centralised Signal server.

Matrix needs support. If federation is important to you, please consider supporting this alternative to Signal.

Oh! and you can use your independent Matrix homeserver to communicate with people on the Signal network, because bridging between the two networks is part of the Matrix architecture and there's an excellent matrix-signal bridge already.