To become a problem, they would have to hold stake. I suppose there is some chance that could happen, it seems unlikely, someone is going to spend much money to troll.
In a delegated proof of stake project, I guess that is a risk, but that would make it their stake to use.

The beauty of the blockchain is that each member of the community controls their own stake nothing less and nothing more. I think it is highly unlikely to become a problem. Really the biggest problems with flags is the over emotional reactions. I hope we get past that.