OpenAI couldn't do a google style many endpoints style product diversification. OpenAI wants to make big models that do stuff no one else's can, period. They aren't going to waste their time making, for example, a therapy chat bot, and a code helper, a semantic search platform, etc. and, curate, market, and bottle them all separately. If they wanted to do that and focused their business on that Google would easily beat them because they have much better inertia with all their existing services. It makes much more sense to let other companies just use their simple API to do so so they can focus on being the very best at the core models they offer.

The issue with Language models for the companies that create them is they are so general. If a company builds a language model into their backend, and another one comes out from a different company that's 1.3x as good, it would be trivial to switch to the better one. It's not like a company being so tied to AWS that they can't even fathom switching to another cloud platform because all their internal shit is built in to the thousand specific ways AWS works. As a result, to be competitive you need to be the very best in that realm.