If they had any intention of EEE the fediverse, they wouldn't have required users to opt into it, or made it unidirectional.
I think it's pretty clear at this point that their only intention was to head off antitrust actions. But I think it's safe to say we won't see anymore development on that front in the near future.
Facebook famously didn't have ads for a long time, even when people were pressuring Zuck to add them to keep the site from going running out of capital. Call it a loss leader, call it enshittification or market capture, whatever. Most companies that can afford to will start out being really great to their users, and once they have captured a section of the market, they start clawing more of that value back for themselves and their investors.