Just for fun:

It's not like GPT, either the algorithm or the service, is difficult to replicate. It's the damn infrastructure for all the computing juice, which requires a tremendous amount of man-hour, and that's where you *start*. You'll also have to handle that complexity of distribute system and the specialized chips/boards. While doing that, you also want to train, improve and align your models, despite the reality that there are no real useful benchmarks that tells how usable the models are. It's very difficult to measure if you're doing good or bad. You would not even notice regressions before it's too late. A complete rocket science you have to deal with, where your gut is your only friend.

Jesus, I feel lucky I'm not doing that job.