You would think, if you were being honest about it, that you could build into your app a "checkin at my garage" function that would allow you to prove that after each fair your driver followed the law and went back to their garage.
I don't see how disobeying the law is any more dishonest than following it, the courts are going to tax you for it but as long as you pay there shouldn't be any problems.
Morality is a whole different thing, I for one don't find it immoral for a driver to pick up passengers without stopping at the garage first.
Anyway, it's called civil disobedience. I'd have though HN would be the last place to condemn that.
This might be different if the law in question wasn't utterly ridiculous.