especially for subscription services, I have the feeling that the jump from $0 to $10 /mo is far, far higher than the jump from $10 to $50 /mo, and the difference between $0->$10 $0->$50 is fairly low, in terms of how people approach payments. Ofc, I have nothing legitimate to back this up.
But if I'm correct, and that people are more payment-adverse than they cost-conscious, for online subs, then it's generally correct to follow the subsidy-model rather than anything else. Subsidization is anyways far superior to the advert-model -- though it can be abused when taken to the extreme, e.g. gaming whales + gambling mechanics, but in a corp-to-corp setting I'm not seeing to much risk there. The other side of it is that enforces monopolistic structures -- essentially forcing global market share by leveraging your enterprise weight -- which is more concerning to me but seems to be generally inevitable (gov intervention is really the only thing stopping monopolies from existing, because really by all right its a perfectly valid market strategy)
I'm assuming I'm correct because companies keep implementing/switching to this model (and this is the best reasoning I can think of), but maybe its just part of a non-intelligent fashion trend (signalling difference from LEGACY software model to MODERN)