I did this situation with a friend. But they had already know me for a year from our trail riding club, before I hinted I might like to bring my mare to their place, and they stated they might be up for that. I paid for all my horses hay, bedding feed, etc. I also AM fed on the days she was working. She works a 3-2 schedule, and clocks in at 6 am. So it was a huge help to have the horses fed, turned out, and stalls done, on those days. There was minimal in terms of facilities. Wire fencing, a solid barn with fans, ample turnout, and we hacked on the roads and neighboring crop fields. My mare died and we tried my gelding at her place, but he was too distracted by her mares. Overall it worked great for 2 years. My older mare got a really great situation with tons of hilly turnout and good mare friends. And my human friends got a person to keep an eye on things during vacation, and someone to share the horse are workload with. They still had a ton of other property maintenance to do.
If you can find a friend, who will contribute to the work regularly, I think that is a very workable arrangement. You might reach out to your local horsey friend network and see if anyone is looking for what you might have to offer. But I would make sure they are sharing the horse care work.
A random person off an ad? It could still work, but you are going to have to say no to a lot of people before you find the right person.