Pay toilets are nasty, and ought to be illegal. Those of us who are not poor can afford the price, if we accept the practice; poor people can't. To deny people access to a toilet when they need one is nasty and degrading.
I have concluded that the least we can do, to eliminate pay toilets, is to avoid giving them money. Instead of paying them, I go to great lengths to find some other toilet.
Please join me in rejecting pay toilets firmly.
Research sourced from stallman.org.