I think this is the big bet a lot of startups are taking. Aggregate demand quickly with GPT4 and then migrate off to another LLM. The assumption here is those other LLMs can be specialized to perform better than a general purpose one.

A pattern I see across all of these plays is some kind of unfair advantage with distribution. Jasper, from what I know, was started by founders ran a content company and had a pre-existing set of customers. Looks like atleast one of the founders of Harvey knows the legal world and secured some pilots that way.