You can't handwave and say go do your research on some micro-niche open source project that's way behind the SOTA and has nowhere near the same reach. That's not what "best practice" means here.
I get that it's difficult to define the line where that gets crossed. But the idea to provide a publicly funded trust that manages legacy versions of things like this is not a bad idea.
That said, what if OpenAI shut down codex because it has dangerous possibilities and amoral “researchers” started figuring out how to exploit them? What if it was fundamentally buggy or encouraging misleading research? What if codex was accidentally leaking or distributing export-controlled or other illegal (copyright, etc.) information? I’m explicitly speculating on possibilities, while you’re making unstated assumptions, so entertain the question of whether OpenAI is already doing a public service by shutting it down.
What evidence is there that OpenAI’s codex has become a social utility? How many people used it to publish? Do you think the US government agrees? How likely is this case to go to court, and result in OpenAI being ordered to provide ongoing access to codex? That seems pretty far fetched to me, but I’m willing to entertain the possibility that I’m wrong.
Are you certain there aren’t problems with codex, that OpenAI isn’t working on something better, and/or shutting it down because it’s causing harm? If so, why are you certain?
1) this source could go away at any time, and
2) the source is only a reflection of the interests of the third-party, not something to be taken at face value.
No 2 can certainly be the subject of research, but to do so without accounting for No 1 would indicate bad research practices from the jump. For example, they could have (and should have) been snapshotting the outputs, tagged with versions & dates. By the sound of it, the outputs weren't even the subject of research, but were instead propping up the research. That flies in the face of No 2 as well. Let them start over, with better methodology this time.