The spying is horrendous. Even after taking so many measures, I still swear I’m eavesdropped occasionally. Ad blockers, private DNS, Firefox containers, GrapheneOS on my phone (I only install messenger, not the Facebook app). I don’t use Facebook on Windows.
I wouldn’t be surprised if other people’s devices are collecting info about me. I have no control over that.
Unfortunately it’s at a point that I won’t get invited to parties without it. It’s how my friends all organise events.