I don't know who Dennis is. Do you mean Demis Hassabis of deepmind? If so, sure; they've certainly done great work. DeepMind in paricular has demonstrated their commitment to advancing science and making their progress work for everyone; I'm inclined to believe it's more than lip service when they talk about making the world better.

My only concern with those two (Deepmind and openai) is how much control do these founders really have over the end products? Deepmind in particular has for years been trying to negotiate with google to make themselves operate more like a non-profit for this exact reason that they don't want powerful AI they create to be controlled by 1 for-profit company, but Google declined (I speculate that it's because the whole reason they've invested billions into deepmind is to make a profit off AGI). So yeah, Demis may have the best intentions and honestly mean it, but how much power does he really have to say no to Google?

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Altman & OpenAI was having similar funding issues a few years back; they were getting bankrolled by philanthropic billionaires like Musk, but the route that they took their research: focusing on scaling for all the headline stuff, is insanely expensive, and they needed to make deals with Microsoft to make ends meet. I don't know what the nature of those deals are but I'd imagine it's similar to what deepmind and google get; I find it hard to believe that microsoft will just throw them billions in funding and compute out of the goodness of their hearts.

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As for Musk, I don't trust the guy; he's very "used car salesman" in how he talks about his work; always overblowing its capability. It erodes credibility and any benefit of doubt I'd give him. Anything Musk says I won't believe until I see it, so I'm not even going to seriously consider him on this topic