> They also can’t seem to get a sufficient supply of washing machines and instead have a laundry bureaucracy.

Sounds like you're just ill-informed? There are shared washing machine rooms in a lot of apartment complexes, although it is getting more rare in newer apartment complexes. You can usually book a slot and then you do your laundry. There is absolutely no shortage of washing machines though.

> Don’t Swedes just rent them out on the black market instead?

They do (with obvious drawbacks of anything illegal). And the black market prices are awfully high.