That's a ridiculous comparison. To make it more accurate, though: if the restaurant was also storing a copy of my personal data, recording my every move, and interrupting my meal to shove food I didn't order down my throat, I certainly wouldn't tip anyone at that restaurant, and would prefer to eat elsewhere. The servers who choose to work there have no moral right to complain about me not tipping them, and eating food that is available for anyone to take without paying is certainly not equivalent to stealing.

Once, and if, I'm given the option to actually pay for the service I order instead of this insanely hostile experience, I'll happily tip for it as well.