Maybe the hacker is the same person so they find a loophole to do it twice, if the ETC doesn't justify everything then no one will believe in this project anymore and it will dump it.

https://blog.bitquery.io/attacker-stole-807k-etc-in-ethereum-classic-51-attack
https://etc.tokenview.com/en/chart/dailyHashrate
https://bitinfocharts.com/comparison/ethereum%20classic-hashrate.html
https://etc.ethermine.org/
https://twitter.com/etherchain
https://twitter.com/binance/status/1291225022866944000_org/status/1289489999004463111