Sadly mate.... This scenario has become symptomatic of the "£50 buys you a tent/bag/cooker etc" from half raids Argos etc and allowed the masses to ruin a whole heap of my fave spots.
As anyone that has camped along with us... And as a Landrover group, I'm sure will testify we leave our pitch cleaner than when we arrived.
And that stands equally even IF it's a commercial site.
Respect costs
**** all mate.