There are a multitude of restaurants. I am personally familiar with many of them, some with websites, others without. That's not the situation I'm writing about.

If I am considering patronizing an unfamiliar restaurant, and my only source of information about it is some untrustworthy third party platform, I'm moving on. Like I said, many restaurants exist, I'm losing nothing by going somewhere trustworthy.

And again, I cannot emphasize this enough: I do not want some third party asserting itself into my relationship with the restaurant.

Possibly, yes. If I am unfamiliar with the restaurant, or I have a question regarding their menu or my dietary restrictions, if they do not have a website with an email address or contact form AND they do not react in reasonable time, I will not eat at that restaurant.

Without question if I can’t find a menu online I will not visit the restaurant. Doesn’t mean they need their own website though, just need to show up on some aggregator when I google food near me and peruse the results to pick something.