They would, there are lots of local online platforms where they can have an online presence. In my country it's services like TakeAway, Deliveroo, Uber Eats that bring in a lot of revenue for smaller restaurants. If you don't want to hire a developer or local web development agency you can use Wix or any of the other website builders to create a small website for your business. If your company has a recognisable name, it's easy enough to get a fine ranking in Google's search results. I think we'd do fine without Facebook.