Good question and observation. I think Reddit set out to crush any and all competition with loyal fanbases and a business model. No coincidence that the surviving apps are severely feature-limited and run almost exclusively by hobbyists (such as is the case of Narwhal; it is not the dev's job. He is an executive with a side project).
It seems pretty clear what is going on here. Reddit thought Christian of Apollo would just roll over and take it. He exercised his rights and recorded conversations and saved transcripts of Reddit lying to him, and released them after they started libeling and slandering him and his business.
Reddit doesn't want that to happen again. I would guarantee that the NDAs being forced on these devs have clauses which prevents them of speaking ill of Reddit or making any statements regarding similar circumstances. They will just bend over and take it when the time comes.
And those devs are OK with that because the surviving apps are all hobbies, nothing more. Reddit lined them such that they can be easily swept away when needed.
Meanwhile, even communities under active attack--like r/Blind--are not moving. They are, similarly, just taking it. Even as mods make it very clear that they cannot perform their jobs even with Reddit's "carve out" to profit from the unpaid labor and expertise of mod tool creators. Even as users reaffirm that they can not use the site anymore, whether through surviving hobby apps or otherwise, because reddit refuses to hire on certified accessibility professionals or even put their own users through that training.
Excellent post, and it is truly heartbreaking stuff. We know Eugen signed an NDA with Meta which just seals the deal for me given the other refusals to answer basic questions. I think he is probably a person who is finding validation for something he's worked on for a very long time, and Meta is blinding him. But that's what they do. They are emotional manipulators by trade.
This is exactly what happened with RCS. Sure, it is an open standard. But Google EEE'd it by adding proprietary functionality using their near unlimited budget and influence, then built it all around their own proprietary middleware, like Jive, to lock out others. Some of the most popular messaging apps, including Signal, had been begging Google for RCS access for years. Google refuses, because they firmly control it now. Only a handful of partners get to access the supposedly "open" standard which Google has co-opted. Sure, you could pour resources into the old, unmaintained RCS standard from over a decade ago. Before Google essentially killed it by moving proprietary and snuffing it out. But then it wouldn't work with Google's RCS, and Google's RCS is what people know as RCS at this point.
Meta will do the same thing with ActivityPub specifically, and decentralized social media in general. They will EEE their way to the finish line. They will wall it all off and prevent account portability and cross-communication outside of a preferred partner network. I could see them walling it off to the Meta-owned properties as they seek ways to further tie Facebook, Instagram, and Whatsapp together under a common protocol which they've EEE'd.