I think something like that could and should only work at the government/public/macro level. One approach: when a tenant gets back their deposit via the deposi

I think something like that could and should only work at the government/public/macro level. One approach: when a tenant gets back their deposit via the deposit protection scheme they get asked to rate their landlord and provide further feedback (data provided is private to landlord and tenant). This is then used to score landlords (similar to credit scores) - for example if they consistently get bad reviews from tenants who got back their full deposit (so "good" tenants) their reviews get reviewed by a person and they get barred from landlording or have to pay a penalty. It is admittedly a very elaborate process that will induce a lot of overhead, but housing market is so broken in most of the world and will probably require radical intrusive policies to fix. Making landlording less appealing/ more work by punishing bad landlording is not a bad start.