Are you sure this is not a false equivalence? I can kind of see your point being an argument based on principles. If the miners did collude they could freeze your wallet. Or at least they could slow it down dramatically and make transactions a heck of a lot more expensive.

But its not part of the core design of ETH to be this way either. But I guess that is kind of irrelevant. What does it matter if it was the core design if its still possible? Thing is though, this seems pretty unlikely to actually happen. But yeah I guess it is actually true, it COULD happen.