realistically your only hurting the person that lives there next. Even when it eventually becomes too big a problem to ignore that'll prompt the landlord to hastily cover it up and sell it. And you are also hurting the city pipes as well which costs everyone money.
The landlord will then have to have the drains cleared and hear exactly what they found blocking it. This will improve your relationship with your landlord and they will feel happy that you decided to take revengeful steps against them which don't really serve any purpose and are just a waste of resources. No way are they going to somehow claim back those costs from you