It really brings down the price of a single night or weekend stay when you're just using the bed and bathroom and cleaning is a 10 minute job.
I think it only works in a high trust society, my fellow American countrymen are mostly incapable of actually doing what they promise in this regard, the nordics have enough societal responsibility and shame involved that you can reasonably expect people to do what is asked of them. A system like this in America would probably fall over from abuse by people who would not pay for the cleaning and then not do it
My father runs a few guest suites out his house and the cleaning cost, wear and tear of washing linen makes single night stays really impact his bottom line, hence him having a cleaning fee which is per stay rather than per night.
Prospective guests can then choose for themselves if they feel the overhead of the cleaning fee for such a single night is worth it for them and my father doesn't land up with uneconomical stays.