What i'm interested due to all the talk of getting deindexd or sandboxed is have you ever managed to get one of you competitors deindexed? For example what would happen if i give a direct 77k list Scrapebox statspages blast to one of my competing sites? Or additionally spam comments with the other backlink. Worst case would be that he gets alot of backlinks and is even stronger than before. But if this was working, wouldn't everybody just start spamming competing sites?