I did find it strange at first too, certainly there would be better use for such a level of AI than building Disneyland 2.0. But it's actually explained over th

I did find it strange at first too, certainly there would be better use for such a level of AI than building Disneyland 2.0. But it's actually explained over the course of the season. The character played by Hopkins tried his hardest to keep the technology within the park. That seems pretty odd at first but his reasons to do so are stated explicitly in the final episode. Many people try to get the technology out but they all seem to have failed so far.