How is “leave the platform if you don’t like it” not the solution here?

Facebook’s creepy stalking of its users is well known, and it’s practically their only method of funding themselves. The calls to regulate Facebook just sound like entitled users attempting to use the hammer of government to reshape the site into what they want.

Can anyone here make a case as to why regulation is preferable compared to letting the free market force Facebook to change or die? I’m legitimately struggling to find any legitimate reason to do so.