Interesting details brought up here about location specifics. At least in Zurich most ads contain an address. I fed it to google maps api to get the time by bike to my workplace which gave us some cheaper options we wouldn't have considered before. We also ended up taking/getting the one with the worst pictures. Imagine someone would scrape all platforms for your city of choice and aggregate those with some value added and maybe automatically apply with your personal documents to make sure your application gets in first even when you're busy, what would it be worth to you? Despite local differences it might still scale.