What makes you think your "cheap or open source model" running on your piddling desktop cluster will be able to complete against a SOTA one running in a billion-dollar datacenter?
It's a cyberpunk fantasy. It won't work out that way.
Maybe? We dont really know this right? People have been saying this for 5 years now and the models are still getting better. The companies running the frontier models have already scraped everything on the web, but the models are still getting better, even if it's only marginally better, with each release. Maybe eventually some company will actually achieve AGI/ASI, who knows..
And then they take that model, put it in a billion-dollar datacenter, and kick your desktop cluster's ass with it.