Because the resources required to run an overlord-level AI require a megacorp to fund them, and a megacorp to run the data centers (plural) needed to operate the neural models.

Open source models running on local hardware serve the needs of individuals and do what you want. But you're not going to be able to provide or gain access to much beyond what you can pay for. Megacorps like Microsoft, ABC, or Apple can pay for an awful lot.

Linux Nation will be considered too small and inconsequential for MS and Apple Nations to take the time to squash.

I want to be able to fork my AI overlord.

It'll be a dog walking AI, created by accident by a grad student who failed to get into a good startup (He was a dick or something). We will be born and bred to walk dogs.

But then people will fork it and suddenly you have thousands of Doge and rule34 AI overlords forcing you to say "yes senpai" in a dog costume in addition to the original AI overlord forcing you to work the cobalt mines.