Is there any line of leftists that are either developing ways to use the same online tactics as the neofascists (eg. flooding every comment section with the same opinion to dominate the narrative, with real comments or not) or ways to render these tactics obsolete?

This kind of stuff is extremely effective, as the last decade has shown. Then, why is it that I only hear of the fascists developing and using it? Why is the left ignoring this efficient stuff?