Seen loads of that on social media, obv targetted by big social as I am defo at risk of riding offroad and having fun..
Think the UK is really on a knife-edge (Could argue it has been for 20 years) in regard to legal and acceptable places to play of road. The only one near me in Scotland (where there is effectively ZERO legal offroad locations for road registered bikes) is Drumclog, a big farm with many tracks, mostly for proper MX bikes, few little bits you can do on road orientated bikes, only £20 a day which is incredibly fair, but its rarely open now, mostly for special organised mud bogging type events.
Seen plenty of folk on youtube that I would normally respect, but in the last year during C19 have been off wrecking all the MTB and walkers trails in various forestry sites around, then dumb enough to post online.
Byeways in England are really under threat, the easily accessible ones for park + play types with proper MX bikes are massively over-used, and technically illegal as they aren't road registered, when police then get involved it brings negativity down on all users of BOATS/green lanes
In the USA + canada its quite common in some states to have giant pay + park + play type centres, private and some public (Arizona, Oregan and Utah) to keep the masses from the national parks I guess. In the UK hard to do as every bit of land belongs to someone. Family once nearly bought an old pub next to a disused quarry that during the purchase process was bought by a group to use for a pro MX course. Didn't buy it in the end, but was going to have a 'Sunday only' usage limit on it by council which I thought was fine, others hated anything that made any noise.