Right, and if Tesla was called OpenCars or something it would be entirely reasonable to criticise them on that point.

Isn't that the point though? Tesla in not called OpenSelfDriving because it takes serious cash at this time in history to fund development of that tech. The fact that OpenAI happens to have a name that suggests otherwise doesn't change that fact. And Elon knows that. Therefore, he's just playing the media game right now and trying to detract from their success. Either that or he's just jealous (more likely IMHO) because he can't go along for the ride or claim much real involvement. I say thank God for that. We dodged a collective bullet with that stroke of luck.

If it wasn't feasible for OpenAI to release their model weights and code then they shouldn't have named themselves OpenAI.

On a philosophical level, I agree. But I also recognize that life doesn't always line up nicely with philosophy. In any case, it seems to me that most of the work that led to ChatGPT was done in the open. How ChatGPT works is not really a great mystery.

Since when was Tesla created to be open-source and non-profit?

They did open source all of their battery patents. Tesla isn't Mozilla, but they do have somewhat of a moral high ground to stand on.

That is marketing spin, his offer was freely licencing their patents in exchange for free usage from other big automakers which he knew would never happen.