The real negative issue with Ethereum-based scams isn't that the scams themselves siphon up ether--that's effectively indistinguishable from any other market activity, legitimate or otherwise. The problem arises when people new to crypto lose money in a scam and are then forever turned off from the market, in the process telling anyone who will listen about how they got scammed out of ether.

The best thing we legitimate users of the Ethereum ecosystem can do is shine as much light as possible on scams so as to protect new/naive users from losing their hard-earned money.