Those large companies already know who you are. its not a slippery slope it's a black chasm the moment we started buying smartphones with google or apple accounts we fell in.

All that is left is making it official and making it work both ways.

if McTuktuk from bangladesh bans you and harms your business for what ever reason you will be able to go to a lawyer and say he mctuktuk@facefuck banned me for no reason and caused me x damages.