That would be quite optimistic, but this is something I’ve noticed at multiple restaurants myself. I saw the tip “suggestions” were not accurate so I checked to see what numbers they might have been using and tried the after tax amount etc, but nope the numbers are just inflated artificially. It’s happened with or without alcohol on the tab, with and without sale items, and I don’t ever really get anything “comped” unless it’s a sauce on the side or something. I wouldn’t say it’s a scam, but I did roll my eyes the first time I noticed it.
My kid just had a screaming fit with big fat tears rolling down his face because he reached the bottom of the stairs. The other day, he was howling crying because I had a different colored bowl than he did. I have indeed had to carry my kid out of a public space to go calm down. I do my best to be calm and empathetic to him but emotional regulation is something they grow into.