alt Hacker NewsPage, Brin, and Schmidt all dated Google employees. Gates married a Microsoft employee. I’m not sure if any of those folks dated direct reports, but does it really matter when you’re the CEO? Not condoning this behavior, just saying that there’s precedent for it not significantly impacting careers of execs. The spy thing is a another thing entirely.
Page and Brin have controlling voting shares of Alphabet, so they can't exactly be booted by the Board. Gates met Melinda 40 years ago and many things happened 40 years that would not be acceptable today.