Google is in the most dire situation. They own search, own the browser and phone walled gardens that bring you there, own all the ads, knee-kick ad blocking attempts, have started taking over content (AMP), have a surveillance panopticon, control standards and neuter challenges to them (HTML5 is less semantic than XHTML), have surveillance devices in the home, embrace-extend-extinguish entire product spaces, kill products people rely on, don't offer support ...
Google has its hands in too many pies, actively hurts other industries, and they're creepy af.
Facebook might have less of a case against it, but they routinely flaunt Democratic lawmakers, shape public opinion in bad ways, and buy out the competition. Not a strong case, but I think it would be argued from a social good perspective.
Apple and Microsoft seem safe. I have no idea about Amazon, since they have competition in all their markets.