I think a person who is going out into the wilderness, who has prepared food and water and a tent and told their family where they are going, is probably going to remember to renew the subscription. Apple might even let you do it via satellite.
We had met on a local summit although we had approached it via different routes. We were on a spur off a longer trail--and he took the wrong direction when coming back to the main trail. I encountered him probably an hour later and realized his mistake and got him headed back to his car. Had he continued there was one junction ahead--if he took the left branch he would end up where I was parked which was miles from his car. If he took the right branch he would have failed to end up at a slightly more distant parking lot as by the trail it was about 16 miles away, going over a summit just below 12k' (we were a bit above 9k' at the time) in the process. His phone battery was dead, it was near the new moon and that route goes near cliffs.
Some of them will get lost and some of them will have this smart watch.
And some of those may have an expired feature which could save their life.
The big reason InReach/Spot subscription devices are so popular is that they include non-emergency messaging to family as part of the service.