Great choice for the image on your blog!
The whales could obviously Sybil attack with multiple accounts to benefit themselves, but it would just be replicating the current system if they did and not gaining any benefit above that.
Not only that, but if the whales didn't do that, it would open the vulnerability for dolphins to collude and game the system.
There just isn't any solution.
Yea, I realize this is a very hard problem to solve, so I'm not seeking perfection here, just some type of plausible improvement over current state. Everything with blockchains is just compromises and trade offs. And wtf, I just clicked your link and we are using the exact same terminology while describing the same problem in the same hour and I did not read your comment section beforehand.