It's interesting that we are seeing a time when subscriptions are not preferred and usage-based billing is.
Pay-as-you go isn't a common thing in SaaS. For example, except for AWS SES, all email providers are bulk-subscription based.
The point of SaaS was that the marginal cost (of supporting another user) was low. That does not apply to LLMs.
The point of SaaS was that the marginal cost (of supporting another user) was low. That does not apply to LLMs.