There is evidence that a small group of block producers (miners) control the entire EOS network. These block producers have the power to censor transactions, blacklist individuals, and ensure they remain in power. If these block producers are colluding, then that group can control the EOS protocol to their whim.
These allegations are in culmination with a streak of other troubling news. The delayed release of the platform and the discovery of critical bugs in the protocol have already drawn stark criticism of Block.one and CTO Daniel Larimer.