Yeah, the way I see it Meta is undermining OpenAI's business model because it can, I have serious doubts Meta would be doing as it does with OpenAI out of the picture.
Another of Meta's major "open source" initiatives is Open Compute which has nothing to do with OpenAI.
I see zero relationship between Meta's open source initiatives and OpenAI. Why would there be? OpenAI is not a competitor, and in fact help push the field of AI forwards which is helpful to Meta.
If state of open art pushes forward and is cutting edge, Meta wins (English) by default.