Where are you getting this information and if it’s true? Even if it’s true, Meta isn’t known for sticking with what works for the user, but what works for their shareholders. They will figure out a way to exploit and/or extinguish the fediverse.
In the cruise ship analogy, they will stay on the boat the first few 3 or 4 times so everyone backs down and then they’ll open the bridge for all 5k. None of this rocket science.