I'm a white-collar knowledge worker. There is no downside to me getting my hands dirty with real work during my thinking time – that's time I can't spend with my family if I want to get anything done, because unstructured social interaction takes up the same space in my brain as the knowledge work does.

And the marginal utility of having cleaner toilet facilities increases dramatically when they tip over the boundary between "clean" and "not-clean". Given an apron and long gloves, I'd happily (most days, at least) clean shit off the wall, or pull pads out the U-bend, if it increased the chance the room was clean when I had to use it.

If I were able to choose whether or not to clean the toilets, and someone kept leaving them in a right state, then after the second-to-fourth time, I'd set aside some time to identify the culprits, and then I'd take measures to ensure they stopped, starting with confronting them over it: first in private (if possible), and subsequently in front of people whose opinions I'd expect them to care about. I might escalate further if it continued without good reason. This is not an option available to cleaning staff on the poverty line, who rarely have the time in their schedule to do this, and might be sacked if they used their breaktime to pull an insubordinate stunt like that. (I would not be capable of working in those conditions, and I expect I'd develop new and fascinating mental health problems if subjected to them.)

There is a major difference between volunteering to do something, and having your ability to live in your home contingent upon you doing it, as regards people's willingness to do various tasks.