My solution was an adaptation of the NYC cab medallion system. Each city is allowed to provide medallions for up to a certain percentage of single-family residences to be rental properties and the medallion costs to maintain. It also comes along with rent caps based on the local cost of living and yearly property inspections by the city. One of the towns in my area actually did that last one because they actually care about being a good place to live, so they make some extra money on penalties or the overall property value for the town goes up because all of the rental properties are kept in very good condition. Win(city)-win(tenants)-accountability(landleeches).

Honestly, no city should want more than ~5% of single-family dwellings to be rentals. As you said, it is easier to get out of them. That means less reliable tax revenue, less people invested in the community, and potentially less community. I may be a math major, but I’m not an anthropology or sociology major, so that last one is definitely rectally sourced.

Also, I struggle, being in the exact situation where I need to get out from under an abusive landleech, to say that it is easy to move from rental to rental. Having to come up with 3k when we are already living and to mouth is really hard.