I'd argue that this has even darker motivations than AOL ever did though. At least with AOL people had a choice. There were alternatives to living inside the walled garden.
This seems more like indentured servitude. I suspect strongly that the poorest people that Facebook is targeting here have no option as they can't afford any data charges at all, so will sign up because its this or nothing.
Many of these folks may never have even seen the internet. There's a very real chance that a lot of them will believe that the curated Facebook internet is the internet proper.
I'm sure Mark Zuckerberg considers himself to be a fair and reasonable gatekeeper so doesn't see this as a problem, but this is almost certainly going to be abused sooner or later (spoiler: sooner).