Terrific research. I've seen similar numbers in other articles, and they all point to the same obvious conclusion - EOS is broken (as are most DPoS chains). Cartels/plutocracies in decentralized networks is the worst of all worlds. I've criticized DPoS enough over the years, so I'll stop right here.

PS: Centralized exchanges and subsequent turnkey staking solutions will always exist, and will arguably continue to grow as more of the mainstream starts adopting crypto. All blockchains must account for this eventuality. If your system is not resilient to this potential attack vector, then it's existentially flawed and must be replaced with a better mechanism.