There’s secret and then there’s secret. Like, the enduro trails at innerleithen aren’t on any maps but they’re secret with a small s- they’ve been race routes, etc, so word is out. And they can deal with (sensible) traffic too. These things, no harm in spreading the word.
But then the stuff over the river, I think most people know there’s trails up there but not so many know where they are- Secret with a capital S, and possibly a k as well.
But it’s not always so simple is it. Strava certainly doesn’t see any distinction. I’d be uptight about that, but then, I used Strava to find some golfcourse trails I didn’t previously know about so can hardly grumble!