I don't agree that the open source AI is good. The commercial AI models are much better. I've tried and gone back to the commercial ones, i.e., Claude, ChatGPT, Copilot, Gemini.
I suppose that you could train your own open source model that was just as good as the commercial sites if you had the right hardware to support it. The tools are out there for anyone to access and set up your own.
It's fun to play with the local models if you are a PC enthusiast like I am, but, for serious work I'm going back to Claude or ChatGPT. If I have to upload work data, then Copilot because we pay for it and the data is not used to train the model per our license.