on the meaning of open, a tangential issue, let's have Sherman set the wayback machine to when the word "open" first started being used. "OK Mr Peabody"
open has a number of meanings that are useful, but have been overwhelmed by the concept of open source.
but open standards used to be the meaning. "ethernet is this, here's how you talk to it, but we're not going to write the code for you" (i'm not claiming that ethernet was originally an open standard, just using that as an example of what an open standard means)
and hardware manufacturers used to include blueprints/schematics (for repair, or for interconnection, for example) and commercial software vendors would show you the source code, but at the same time, you weren't being given intellectual property rights or licenses to anything, it was just part of what was required to encourage customers to stick with the product by making it easier to fit in where it was going.
And all of this was a really useful kind of openness. Just mentioning it because when people talk about how open OpenAI is, I'm never quite sure what they're expecting (I don't mind any expectation, not judging, I just don't know)