What questions can tech CEOs be asked, to guage their moral trustworthiness?

It takes practice. After meeting 100 CEOs and watching their companies evolve for 5 years, most people can be OK at it. Some people (famously Jessica Livingston) are much better than average. But few people have the chance to practice that much.

If you haven't had a lot of practice, ask people who have. Investors and other CEOs typically have lots of practice, though sometimes they aren't trustworthy themselves. So ask several people and discard outlying opinions.

Ignore the press, unless there are external facts like a conviction. The press is full of snark and innuendo about CEOs, most of which is just reporters trying to cook up a narrative people will click on.

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"How do you feel about unions?"

I found a good question to spring is 'name a time you had to make a moral decision'. If someone thinks about decisions in terms of morality it's a good open-ended question that'll lead into how they approach moral dilemmas. If you suspect you're getting a rehearsed answer, follow up by asking about a moral decision they made where they would have acted differently today. Anyone who rehearses an answer to that question is going to rehearse one where they made the right call, but anyone who actually thinks about things in terms of morality is going to remember a time they made a mistake.

The opposite is also true. A belief in a higher power is no more or less indicative of destructive behavior than a belief of a universe without