I had a landlord who wrote into the original version of the lease that I (as the tenant) would be responsible for any needed repairs to the sewer system. This was a much more extreme version of being unwilling to unclog a toilet lol. I said fuck that noise and he took the clause out. He turned out to be a good landlord and he didn’t raise my rent once in seven years, but his tendency to just try and get away with whatever he could in the lease had me a bit worried at the start.