I have ONE contact who uses Signal. Yes, it's a shame but at this point I think that I could convert more people to using Linux than to switching to Signal.
Same here. I wonder if there is an easy way to leave an old phone with whatsapp at home and forward the messages to my daily driver. Would prevent the zuck from reading out my contact list at minimum. I know he still has everybody else's but still.
As a workaround, you can bridge most services to Matrix. I currently bridge Telegram, Signal and SMS to my Matrix server and only need Element on my phone and desktop.
Unfortunately Element is fairly focused on business users, would be cool if they could host bridges for individuals to make the barrier of entry easier.