Freecyccle / facebook marketplace +1
There’s usually someone (occasionally me) who’s bought a new car and needs to make a boot liner, or want’s it for the garage as it’s far nicer to kneel/lie on under a car than the bare concrete.
A lot of the recycling is they get shredded and mixed with sand to make the bases for showjumping / dressage arenas as you need something loose/dry like sand, but bound together enough that the hoses don’t slip/sink into it, but not organic soil that turns into mud.
Hopefully they separate out the cheap polyester/nylon carpets first otherwise that’s tones of microplastics being churned directly into the soil!