What was the coolest thing Apple unveiled at the Worldwide Developers Conference?

The neat way of protecting your email address when you join an app. It allows the app developer to send you messages but not to know what your address is, which protects you.

How are the DOJ and FTC deciding which tech companies to investigate?

Well they get together. They meet in a room. They see who has the expertise. The FTC knows a lot about Facebook. Also they probably fight and there's all kinds of weird politics because if you work at one of those organizations it's much better to get a juicy case.

Will Google Stadia be a success?

This is their high-quality online-gaming system. Big new venture for Google. I don't know whether it'll be a success. My guess is this: it won't be a success, but it will change the future of gaming. Google often does that.

Should tech companies become data fiduciaries?

Complicated one. That's a term of art - legal term - saying that tech companies should treat their customers data in a way that is in the customer's interest. Should tech companies do that? Yes they should. Should it be written into law? That's a harder one.