ETH prices cannot be affected by scammers. I think they are just sand grains on a sandy beach. They hold a small amount of eth compared to the amount of ETH being circulated on the market. Prices will not change much when they sell all
If these scammers are stealing a lot of ethereum and then it can give a little impact to the market too. remember they will create a flash dump and this can give a panic selling for short term to the market. But that's a little impact to the market.