> even opening certain accounts triggers source-of-wealth checks.
True. I even had one bank check origin of funds for the transfer I was making from a corporate account held with the same bank where i was the UBO to a private account on my my name with the same bank; this shot gets ridiculous very fast, and this is the exact reason why opting out cannot be done partially.
> Buying property
You'd be surprised how many sellers are willing to accept bitcoin. I managed to pay 1/3 of the amount for a flat in bitcoin just few months back.