The same problem could occur on other chains of course. I have to agree and Bitcoin will become more of a target should its price keep rising. Why couldn't this kind of thing happen on a PoS system? Every cryptocurrency will have someone controlling the Lion's share of coins. Chains with a feature where reorgs are no longer possible after a certain number of blocks, will simply have unorganized forks into two chains with the same protocol and the same name. This might not bother wallets that are always online.
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