As a person that heavily relies on both CLIP (released 2 years ago) and Whisper (released just 6 months ago) in his research, I would disagree with the claim that "open research in AI [is] gone".

In addition, I've needed to run the usual benchmarking to compare my own work with several other models and was quite surprised when I was able to run my full benchmark on GPT-3 solely using the free credit provided by them.

Don't get me wrong, I criticize OpenAI for not completely sticking to the mission they built their foundation in (I mean it's literally in the name FFS) but I wouldn't say they completely closed off research from the public.