Simply put Google has had more time to develop a terrible data hoarding reputation.
Isn't hoarding data for training purposes a key part of OpenAI's business model? I get that they don't have a reputation for selling that data (or access to it) yet, but, what happens if/when funding dries up?
I definitely don't trust Google -- fool me once, and all -- but to the extent I'm going to "trust" any business with my data, I'd like to see a proven business model that isn't based on monetizing my information and is likely to continue to work (e.g., Apple). OpenAI doesn't have that.
I don't think it's about trusting OpenAI necessarily, and definitely not a character like Sam Altman. It's more about Google having a proven record of being data obsessed. 99% of the money they make is from our data. Many other tech giants (Apple, Microsoft, etc) are also hard to trust, but at least they don't have their whole business model built on user data like Google and Meta. I can't blame anyone looking at OpenAI as a lesser evil.