Some humans will need to interpret the thinking and apply it somewhere and take some responsibility for those decisions. If you think AI can do all that end to end it’s a different question but we’re nowhere near that right now.
If you can self host it that easily, any Joe can scale it out much like shared web hosting, and shared web hosting or even dedicated rented boxes has always been cheaper than the big cloud providers.
I don't think OpenAI or Anthropic can reasonable compete in the long term if they can't achieve "AGI", and they won't, no matter what shareholders desire.