I'll bite!
I understand about the service included and the small tip you can leave if so desired

I thought service [Fr side] is always included. However, this is the part that confuses me, someone in these discussions will say if the menu says service not included, then I should leave something approx to the service charge and or tip - guessing a NA type of tip is the target for the resto [assuming I liked the meal and service].

I have always thought that is a scam ie service needs to always be included in the bill [fr side]. This winter at an Orient Village resto, the bill was presented saying service not included, and the waitress echoed that comment - to be fair we did not remember what the menu said. I chose to not believe that and left what I would normally for a meal on the fr side

So my question is - can a fr side resto opt out of the service charge if they note it in writing to the customer?

J&B