Very many examples.

EOS (dPoS) reversed transactions multiple times while being top 10 at the time: https://cointelegraph.com/news/eos-reverses-previously-confi...

Ethereum Classic was attacked multiple times with chain reversing double spends due to not enough energy being committed to immutability: https://www.coindesk.com/ethereum-classic-attacker-successfu...

Ethereum reversed the "DAO hack" with a hard fork.

So yes, shitcoins are definitely mutable.

I said that PoS isn't much easier to mutate than PoW. EOS isn't really decentralised so it's not a fair comparison to other PoS chains and the other two are PoW just like Bitcoin.

On a side note my colleagues are working on improving ETC against 51% attacks at the moment so hopefully that works out. Definitely wouldn't refer to Ethereum as a 'shitcoin'.

https://static.iohk.io/docs/etc/ecip-comparison-for-51-attac...

I didn't expect this, the security argument invalidates 99% of cryptocurrencies and leaves Ethereum and Bitcoin as the only winners. Bitcoin is technologically unimpressive and Ethereum is quite successful technologically but it is having scaling problems.

You know, this is quite ironic because cryptocurrencies are reaching a dead end, through their own flaws.