> the centralization is never monopolistic (e.g., you cannot completely reject transactions even if you control most of the miners) Why not? If you control 51%

> the centralization is never monopolistic (e.g., you cannot completely reject transactions even if you control most of the miners) Why not? If you control 51%+ of the mining power, you can decide not to accept any mined block that would contain a banned transaction, and ignore it in your own blocks. Your fork would just be that for a while, but since you have more mining power, you'd catch up and end up with the longest chain eventually. Over time, the other miners would have to follow your rules if they still want to be able to mine profitably, so they wouldn't even try to mine such a banned transaction.