One huge problem is that anything like that will eventually get abused.

Faucet is good too, but for hotel tipping gotta be different codes as there might be more than one unclaimed tip with different amounts.

Yea. But what's abuse threat vector here. Semisol can't be at the top of every mountain, at every random time frame. Normies would just scan and follow the instructions.

Still an amazing idea... I have some thoughts as to how this could be thoughtfully utilized

I did come up with handful of thoughts how to exploit it too. 😬 Someone just takes a picture/screenshot saves it. Plugs it into a script which will just run 24/7 attempts for milking it. And the donor would struggle to find out. But yea, there might be ways to minimize the risk, do it with non-adversary audience only, built some not protections, ..