Well, of course. But there's a free-rider/tragedy-of-the-commons problem here: people might reasonably think the monetization of their eyeballs is an acceptable cost to be able to use something like Facebook, even if they choose not to be monetized when they get to use Facebook either way.
However, if nobody could be monetized, then Facebook couldn't exist, making those people (for whom monetization of their eyeballs is an acceptable cost in exchange for Facebook) to be worse off.
The only reason piracy and ad-blocking haven't totally killed for-profit media is because most people don't use them (either because they don't know how, for legal or ethical reasons, or because it's a hassle).
However, if nobody could be monetized, then Facebook couldn't exist, making those people (for whom monetization of their eyeballs is an acceptable cost in exchange for Facebook) to be worse off.
The only reason piracy and ad-blocking haven't totally killed for-profit media is because most people don't use them (either because they don't know how, for legal or ethical reasons, or because it's a hassle).