Might be actually better to follow them now. In case these profiles move to another instance, you will still follow them after the move. But if you don’t follow them it might be harder to find out if and where they moved to, to find them again.

Would be nice with activity pub support for sharing planned and recorded trails. Cone to think of it. Does it make that distinction? Planned vs recorded? How about a planning, route finding mode?

Kudos to your project so far!