I reject this logic - it's an argument for sustaining the status quo at all costs.
Facebook is the most user-hostile tech megacorp, and they will inevitably harm these businesses you care about. The sooner the bandaid is ripped off the better.
I mean, sure, status quo can / should be changed - but you want to get to a point where a changed status quo is sustainable, and you're not going to get there by simply removing existing options. It doesn't change the incentives people have for preferring to use the platform, namely the pre-existing widespread penetration.
You want to dislodge Facebook, you need to disrupt it / curtail its monopoly.
Facebook is the most user-hostile tech megacorp, and they will inevitably harm these businesses you care about. The sooner the bandaid is ripped off the better.