Comment by Ravus

I do not think that this is likely to be a successful model.

When (not if) software breaks in production, you need to be able to debug it effectively. Knowing that external libraries do their base job is really helpful in reducing the search space and in reducing the blast radius of patches.

Note that this is not AI-specific. More generally, in-house implementations of software that is not your core business brings costs that are not limited to that of writing said implementation.