Yes one use-case is a gig-economy street photography practice, which does already exist in places like the Brooklyn Bridge, Candid9 makes that easier.

Another use-case perhaps in your case is to do it for free and do higher volume and market your money-making services? I agree that it is fun and mood-lifting to take portraits, but also it would be cool to make it sustainable.

but yeah overall Candid9 is a hammer looking for a nail right now.