Maybe but it is not their problem, they simply pass on a % of their take to railway, it costs them nothing if the take is below the cost of electric, in the summer when tourists are at railway swings and roundabouts it pays for its self, winter when railway not running, it looses money so is switched off.
I'm still struggling to understand how this is a problem? Lots of EV charging station providers "rent" space from retail outlets - so for example, Instavolt will pay the McDonald's branch some money each year, in return for being allowed to put charging stations up and take up a few parking spaces in their car park. Ionity might do the same with a branch of Costa Coffee. So yeah, PodPoint will most likely pay the station something by way of "rent".
But like all companies, they're there to make money, so it's not really a case of "it costs them nothing if the take is below the cost of the electric". They just won't think like that. Few (if any) large companies would sit there and say "well, so long as it's not losing me anything...". They'll have a profit margin that they'll want to maintain. I doubt the railway will charge them any less in winter.
So by switching the charger off, they make
ZERO money (but presumably, still have to pay the station, unless as you say, it's a percentage of the take, in which case, switching the charger off, just means that PodPoint make zero money
AND the railway makes zero money)! Yet they have some capital equipment tied up in the car park, taking up space and doing nothing. If that's how they run their business, they'll soon be bankrupt!
Alternatively, they could just set the tariff not to allow any period of free charging (like pretty much all the other PodPoint chargers I've seen) - job done!