I understand where you are coming from, Florence .. but I doubt if anyone relies on such offers becoming available, in which case they are surely just an optional thing, like any other water source. Accept or ignore, no worries. A pop-up burger bar half way across Sleightholme might be a different matter, I suppose ..
I remember the first time I walked the Pennine Way, someone told me that when I got to the A57 (the snake pass) there would be an ice cream van in a layby where the PW crosses. It was a very hot day, and by the time I got there I had decided what flavour, size and colour I wanted .. I could actually taste it .. and of course, there was no van. I've tried never to rely on any single shop, pub or water source, since...