Sounds like a problem not worth solving? In my wework the handles get wiped down as per the cleanign protocol. Takes what, a second? The costs are marginal.
On every usage??
What about bathroom doors that are touched constantly?
Where I think this kind of idea tries to make its case is in places where cleaning is infrequent, inconsistent, or happens long after peak use
I suppose a second every few hours over dozens of doors adds up. And this has the benefit of being continual, so you don't get build up between cleans.
I'm sceptical myself that the tiny generator they have could produce enough energy, and that the coating they have won't be more of a hassle, but the idea is reasonable
How often do they get wiped, and how dirty do they get in between? The idea here seems to be keeping them sanitary continuously.