Nicely laid out. Very clear and concise, I agree with you.
There is a little spider in my head (one of many) that says Zuck (or any other big company for that matter) won't be able to concede randomness into their business and therefor will never, ever be able to start a real crypto. In the law of unintended consequences, they might just expose a whole bunch of the world to actual crypto. That would be an incredible service to humanity!
Thanks for a terrific article!
In the end I'm not sure that a real fully decentralised crypto is what the greater population wants or desires. There is just too much safety in being able to appeal to a central authority. Well, at least in the short to medium term, perhaps things are different in the far future!
Probably a meld of systems is what will be optimal for most people. But yes, it would be interesting if Facebook proves to be the gateway drug that gets people familiar with the wider ecosystem!