It doesn't have to be even close to "mainly fraudulent uses". If just 0.01% of users use it for illegal stuff that will get your home network connection shut do

It doesn't have to be even close to "mainly fraudulent uses". If just 0.01% of users use it for illegal stuff that will get your home network connection shut down, and an exit node sees a thousand different users a month, then it would be unwise to host an exit node at home.