I was more thinking that LNER would love to dispense with the Anytime tickets and force everyone to commit to a train.It is true that actually making them compulsory will cause them to generally be occupied. I suspect occupation is high on London-Newcastle/Edinburgh on both LNER and Lumo for that sort of reason - because while reservations aren't compulsory on the train itself, all affordable tickets require reservation.
I was asking Tetchytyke what they thought should happen, given that they were opposed to charging.The premise of the thread is how you solve it - charge for them (and I would suggest a partial refund for releasing them, and perhaps something active asking you if you want it, e.g. an in app notification with a simple tap to release the reservation). Then only people who actually want them will pay for them.