Gary Marcus is not the only one that has been critical of Sam Altman: https://www.youtube.com/watch?v=l0K4XPu3Qhg
There's many other people but most of them are independent. It is glaringly obvious now most of the media outlets are afraid to ask the tough questions.
Here is a more fun one to watch:
Sure, but why post Gary Marcus then?
That said, MPU has been pretty solidly crazy with their LLM critiques lately (did you know it uses all the drinking water?!?!?). There are plenty of sane, grounded-in-reality critiques. Why not focus on those?