Can someone please give a technical explanation of how they find (how this similarity search works) private key after someone already finds the private key and starts a transaction? I know mining means finding a part of private key and these private keys are in a narrow window. But there are too many pools, so I would expect to 1 or 2 approvals "quickly". Even if my transaction got let say 1 approval are they allowed to cancel the transaction when they have private key?

Is it a naive approach to create a bot to make ~60 transactions 0.1 BTC each?