Im well into that article, ive built dirt jumps for 15 years and fully appreciate work anyone else has put in.
In my current MTB area, there’s a common whinge that the local trails are being sanitised by the council, they are bridleways/footpaths after all, so the council are obligated to maintain them in such a way that that the relevant users have easy access to the country side.
Instead of whinging that “their” trails are being sanitised (it’s a joke isn’t it), they could put the time and effort into finding a secret spot, putting the time in making sure it’s not frequented by walkers/horses/rangers, then making what adjustments need be, then keeping it secret. Then their corner of paradise will always be there.
Screw the land owner too, just make sure they dont find out. If you do get caught out though, i do sort of expect the upmost respect and fair treatment of the land owner, even putting things back to what they were if they really, really want. This should of been scoped out though really.