[flarex]

The infrastructure to carry out that attack against BCH would cost around a billion dollars in mining equipment and power. Not exactly what you would call a small miner. BCH also has rolling 10 block checkpoints so max you could reorg would be 10 blocks or < 2 hours of transactions.

In reality there is nowhere you could rent this hashpower and miners that do have it would never risk the legal, social and monetary consequences to rollback 2 hours of transactions.

[grubles]

That infrastructure exists already. It just takes a pool's operations to be compromised (in whatever manner you devise) in order to redirect its hash rate. Keep in mind we're talking about small Bitcoin pools here. Not even the larger ones.