And that conditioning starts early in life. Big Corporation is there from your childhood onward, telling you what the good things in life supposedly are.
So, much of the public is going to stick with Big Corporation Social Media Outlet because that's what they've been conditioned to see as a legitimate "higher quality" space in which to gather.
It's what they're used to and comfortable with.
And they have shit tastes but those are their tastes at this point.