If you, as a creator get three strikes (for doing something wrong), you lose your channel. Why not the same for copyright holders... three false accusations, and it's the end.
Because Youtube wouldn't be able to enforce that threat. If a copyright holder complains about an IP violation, Youtube has to address it, or the copyright holder will go to court.
If Youtube starts saying "you've abused our report system, so you're not allowed to make reports anymore", the copyright holder will just respond "alright, we'll sue you every time we find a copyright violation on your platform from now on".
For this to change, content platforms like Youtube would need some sort of special legal status that would say "Provided that we do some reasonable effort to weed out IP violations, we're allowed to ignore a certain percentage of IP claims if we think the claimant is a patent troll" or something similar. I doubt it will happen, though, most governments are in the pocket of media companies and default to assuming content platforms are guilty until proven innocent.
