Yes, really.
They're strongly influenced by Yudkowsky constantly telling everyone who will listen that we only get one chance to make a friendly ASI, and that we don't have the faintest idea what friendly even means yet.
While you may disagree with, perhaps even mock, Yudkowsky — FWIW, I am significantly more optimistic than Yudkowsky on several different axies of AI safety, so while his P(doom) is close to 1, mine is around 0.05 — this is consistent with their initial attempt to not release the GPT-2 weights at all, to experiment with RLHF in the first place, to red-team GPT-4 before release, asking for models at or above GPT-4 level to be restricted by law, and their "superalignment" project: https://openai.com/blog/introducing-superalignment
If OpenAI produces a model which "shocks" people with how good it is, that drives the exact race dynamics which they (and many of the people they respect) have repeatedly said would be bad.