[bramblerose]

I appreciate your response. I feel the same as the other commenter: the asymmetry between "a steep fine" and "losing your home" is enormous. But "what happens if the fine is enormous" (say, the landlord also stands to lose their home) is an interesting thought experiment - how big does the punishment need to be to "fix" the power imbalance?

[giantg2]

That's not really a functional asymmetry. All you need is to pass a minimal threshold to disincentivize the behavior. A fine that outweighs potential illegal rent performs that task.

It also depends on what you mean by losing one's home. That's not an issue for people who would sign the written agreements. Afain, we want a disincentive to informal agreements, including from renters and squatters. I'm not sure how you can equate loss of ownership with loss of temporary use.