The problem with trying to use the DMCA for this is that, provably, no human creativity is involved, and so it's likely that the output of this is uncopyrightable.
It tends to work in practice anyway. Competitors that stoop that low aren't likely to actually contest it. I understand there's a legal liability there, but again, if you research who is doing it, the risk can be very low. And if you focus just on google SERPS, they often don't notice their pages got yanked from the index.
