As you said, it's an anecdote. And it's nice that it works out in that one location.

Alternatively, I've seen how this has affected Starbucks in the nicer parts of San Francisco and the East Bay. Some Starbucks locations smell horrible, some of the restrooms are trashed and there is toilet paper everywhere. In one Starbucks on Market Street, a homeless person decided to hole up in the restroom and take a nap on the nice, cool floor with the a/c going.

I can never support forcing a private business into offering a public utility.