It's interesting because one of the points Sam emphatically stresses over and over on most podcasts he's gone on in the past 4 years is how crucial it is that a single person or a single company or a collection of companies controlling ASI would be absolutely disastrous and that there needs to be public, democratic control of ASI and the policies surrounding it.

Personally I still believe he thinks that way (in contrast to what ~99% of HN believes) and that he does care deeply about potential existential (and other) risks of ASI. I would bet money/Manifoldbux that if he thought powerful AGI/ASI were anywhere near, he'd hit the brakes and initiate a massive safety overhaul.

I don't know why the promises to the safety team weren't kept (thus triggering their mass resignations), but I don't think it's something as silly as him becoming extremely power hungry or no longer believing there were risks or thinking the risks are acceptable. Perhaps he thought it wasn't the most rational and efficient use of capital at that time given current capabilities.