>Are they claiming to be the restaurant? Or just saying you can phone this number and get the advertised product, which is true?
Here's an example. The site linked (menupages.com) is owned by Grubhub/Seamless. The telephone number is not the actual phone number of the restaurant, and attempting to order through this site gives no hint that you're using Grubhub/Seamless.
https://menupages.com/tropical-sensation/953-amsterdam-st-ne...
While search engines seem to have backed off putting GrubHub's fake websites near the top of searches, this has been a widespread practice by them for a long time[0]:
"The company has registered a lot of fake websites.
GrubHub has registered either a bit more than 23,000 websites, according to the New Food Economy, or 34,000 over the last nine years, per the New York Post’s report. The last domain GrubHub registered was in May, when the Post detailed the company’s practice of creating phone numbers for restaurants in order to drive up its own sales."
[0] https://www.grubstreet.com/2019/07/everything-you-need-to-kn...