It used to be open, then they looked the entire research community in the eyes, flipped them the bird, and burned not only their good will, but a huge portion of actually open AI research and development.
Remember they promised it was because of safety when they didn't release gpt3 to the public. They're full of shit and safety means only corporate control.
It's also worth note that this is mostly caused by the ban on sulfur emissions a couple of years ago. The commission that banned sulfur emissions from ships basically decided that they were going to do a big geo engineering experiment and they were going to do it not in favor of humanity against global warming, but in favor of global warming against humanity.
And they decided to cut off emissions really quickly so that we get this massive incredible hilariously bad spike instead of slowly tapering off over time.
Doesn't work. Keep the solar panels on roofs and over canals where they can get sun. Keep the roads simple stone so they are durable and cheap.