Going anyway and just not tipping is also a completely acceptable and legally protected option. Sort of like saying ‘no thank you’ to the grocery store check out person asking for charity donations or if you would like to sign up for the store credit card.
Again, it’s optional. So people can also say ‘yes’ if they want and that’s cool too I guess. Although tipping is inherently harmful to the server’s baseline wage which is a bit problematic, if people want to tip they can and no one is stopping them. And I won’t give them shit about it unless they specifically inquire about it. Since the whole thing is ‘optional’ after all I let them make their own decisions and if tipping gives them a nice release of serotonin or dopamine or something that makes them feel better, who am I to take that from them.