However since about 2019 and especially 2022, I notice more times than not SaaS is actually being used in reference to a Subscription model B2C startup - GPT wrappers, for example.
What gives? Did the term change meaning? Should there be an encompassing of both these ... rather different... models under the same name? Don't business/seat pricing models have much greater compliance/finance issues?
That is all it has ever meant. No more, no less. If you provide software via a model where they access it online (as a service), it is a SaaS.
You seem to be thinking of it the opposite way: "Services as Software". That simply isn't what the term means.
as long as it's a software and a service, regardless if it's b2c b2b b2e, regardless if it's intended for end-users or developers, regardless if it's intended for individuals, teams, smbs, and enterprises.