Elon Musk in 2014 - "We need to be super careful with AI. Potentially more dangerous than nukes" https://x.com/elonmusk/status/495759307346952192
Dario Amodei in 2017 - "There’s a long tail of things of varying degrees of badness that could happen. I think at the extreme end is the Nick Bostrom" https://80000hours.org/podcast/episodes/the-world-needs-ai-r...
They're still pursuing it because without an international treaty, they think it is inevitable. In the case of Dario, they want to align it just enough and be first to stop others causing harm (a vainglorious strategy, yet still a strategy). In the case of Musk and Altman, not completely clear to me.
Google feels less important right now probably, and Demis Hassabis no longer runs Deep Mind as CEO. However, he talked about this early too, and his reason for proceeding was he was only doing narrow AI (e.g. protein folding) which is fundamentally less dangerous.