they have their own miners that is powerful and make it centralized in a way to steal coins from people, in a 51% attack like ethereum classic attack (the same way it happens on other coins blockchain too), you can have ethereum classic on you wallet but all gone because of the attack.
51% attacks cannot steal other people's coins. The most they could do is to prevent their transactions from confirming. Other than that, double spending requires the attacker to have the ability to create an alternative transaction which would require the private keys to create the transaction.
An attacker could send coin to someone, receive something of value in return, wait
n confirmations, and double-spend the transaction via an alternate blockchain. I would consider this to be stealing.
I keep reading in this thread that you need >50% of a network’s hashrate to perform a 51% attack. This is not true. Having >50% of the network’s hashrate only increases your odds of being successful. A bit of good luck could reduce the needed hashrate greatly.
Yeah, you could deem having less than 50% of the networks hashrate a success if you simply wanted to disrupt the network, its probably fairly achievable for a lot of people out there, but as discussed several times over by now, its simply not worth it, especially on a prolonged basis.
Depending on how severe the 51% attack is, an attacker could direct their own equipment towards a pool they control and get miners to mine on their pool via higher actual mining earnings. The pool would have higher mining earnings because it wouldn't have its blocks orphaned.