I still have not agreed to the terms of use since I continue to be able to opt out and am amused by FB basically chickening out requiring their users to actually agree. The normal course of action would be to eventually block access to the app. That hasn't happened.
So, they could turn on ads but then they'd have to get me to agree to that first or risk losing me. They really want to do that but at the same time they are afraid of what will happen.
In the same way they chickened out of their blockchain plans by simply not talking about it anymore. The Meta announcements featured a large absence of any of that. Which basically means they are probably giving up on the whole notion.
I'm guessing Meta might turn out to be more of the same. FB is struggling to come up with things that actually work. A lot of their efforts just fizzle out. Facebook bots kind of never happened. Payments are dead in the water. They threw out the baby with the bathwater when they had an actual gaming platform with gamers on facebook and shutdown the platform in favor of a glorified ad platform.
Actually a good plan for them would be to rewind fifteen years of bad decision making. Of course that would require getting rid of the chief decision maker.