(Some) Leaks: You are responsible for leaks caused by misuse or neglect (such as knocking drain lines loose).

Not to mention that intentionally misusing federal insured mortgage funds is mortgage fraud. 

Just put in the lease that proper  use  of fixtures is on them for any items attached to walls and you aren't liable for misuse.

Main point is that both situations are serious fire hazards, when significant and blatant misuse of illegal sleeping areas/room are made from structures not designed for that high capacity of use. 

House hacking is when you live in the house, and you can get in trouble for intentionally misusing a loan based on owner occupation.

I wonder if I can put a clause in the lease contract to hold the tenant liable for misuse. 

If the toilet clogs due to misuse, they will pay for you or a plumber to clear the line.

We pay for the primary connection to the ISP but point out that it saves each resident significantly over buying their own individual connections.There is a downside that as since we are the ISP customer, if a tenant is misusing the network we have to hunt them down as the ISP will look to us to solve the problem.

Although forcible evictions seem right and good in many cases (and I mean that), it has been misused so frequently that it is outright outlawed.This is going to be subject to your local laws and Tenant Landlord Act, so run this through that filter, but in essence this is true:- The people living in your property don't have a rental agreement, but they do have a tenancy. 

You need to research the tenant first, are they genuinely good guys prior to the covid thing or are they really misuse the moratorium for not to pay the LL.