Greenbelly Meals is one. I think if you look for services targeting hikers, especially thru hikers, you may find a few former thru hiker entrepreneurs. A while back I saw online a service providing mail drops for thru hikers that I believe was started by former thru hikers. I suppose Jennifer Farr Davis is an example thru hiker entrepreneur also. I saw her speak once; she was very good and I've enjoyed a couple of her books also. I think there are some former thru hikers that make at least some of their living using YouTube.