Most Grubhub and Doordash restaurants don't do delivery.
When I say "they don't do delivery", I mean the restaurant doesn't do delivery. DD or GH provide the service to you. But if you call the restaurant directly, they'll tell you they don't do it on their own.
Which was the context of this conversation ("Why don't people directly call the restaurants instead of using GH?").
I try not to use those services too often. I don't agree with their dishonest pricing and predatory business practices. As another commenter mentioned, those restaurants don't do delivery -- your postmate or whatever is working for postmates, not the restaurant.
I've been doing a lot of takeout as most days its my only trip out of the house
They all do delivery, and I pay online.