The home rental market is huge. In some cities it is very competitive to rent an apartment.
One of the biggest issues for landlords is how they would trust you with their property. Here in Germany they use credit score and your salary as proxies for how good you are. This is not fair.
There is an opportunity for a company to become the global tenant score provider. A company you pay money for to go talk to your current/previous landlord(s) and get feedback on you. Then you can use this score to apply for apartments.
I think this is more fair than judging you based on your current salary.