True they can make their choices but it also means I won't support them in any way. Or recommend them.

I'd use something that's truly decentralised but signal is just another walled garden like WhatsApp. Just one that promises to behave better. But what's a promise worth these days?

A decentralised network would mean a guarantee that they can't do anything bad. I'll take that over promises and good intentions any day.

I don't care about the masses. If signing up for a matrix account is too annoying for them they don't really care about privacy anyway. After all it's the same they have to do for any online shop. Just create a username and password. Somehow it's not a problem for the masses if they wanna order a phone charger but for matrix it's suddenly 'too complicated'?