Don't wild grapes have male and female vines? You would need to make sure to transplant some of each or you won't get grapes. I don't have a source on that but I'm 90% sure that is the case.
Wild grapes do have male and female vines. You'll most likely find vines with and without grapes. I wrote to our Garden columnist. Carol Bradford and she enlightened me. I have more than a few without but only one that had grapes. It not being rooted on MY property concerned me. She said to take cuttings, but I haven't looked up how to do so.
Now I do have some Concord grape vines a friend gave me. Long story, house being sold, come and dig these up and I did. These pics are second year. I hope for some grapes next year. Though I still have some in the freezer. Plus 17 cups from another friend and the four cups of wild I picked this year.
IMO there is plenty of free food out there. Folks have just not been taught how to feed themselves.