Considering that you just wrote a PhD thesis, I'll have to take my time to read through all your text with care. But I can guarantee, for sure, that I'm currently an active writer on Hive because of OCD: by creating good content on OCD Incubated Communities, I had a real chance of being manually curated by a real person. Sometimes I didn't received a big vote, other times I did; but all of this made me stay on the blockchain, understand it better, know about its tribes and communities. And now, almost an year later, I'm here, investing, gaming, and knowing nice people all around.
It's very difficult to manage a huge project like OCD, and I know that it's tiresome to deal with people when there's money involved. Kudos to you for keeping it up and trying to make things fairer for everyone involved.
Most of the difficulty comes from wanting to decentralize it, i.e. bringing in new people and hoping they have the same views as you and philosophy when it comes to hive and its curation, etc, of course many are also trained if they are completely new to Hive and get to know about the rules and restrictions we have in place. The biggest difficulty is definitely the anonymity of it all, since anyone can create an account or more and remain anon/unverified the only thing we can do is attempt to reward those who put in extra effort into their account socially as juggling many accounts where you are both active posting, curating and commenting is not only very difficult but one mistake and your reputation gets wrecked.
Anonymity and Decentralization has its good part but also the bad part, as we can see right now with the whole "Russia is using crypto to bypass sanctions" thing: we can't have anonymity and decentralization without creating some new problems.
As you said, anonymity is a reality on the Blockchain; and finding indirect ways to combat fraud due anonymity (like curators creating bogus accounts just to curate himself, but being difficult to be socially active on all bogus accounts), while it can actually work, just put more pressure and create more paperwork to the honest folks that has to audit the whole thing.