There are different rules for different circumstances. We’ve currently got experts across the world and across 1000+ companies, including all the top ones, and we’ve never heard of anyone facing issues on this front.
However, if you are nervous about this, we encourage you to check the regulations around tax and side-incomes in your jurisdictions, or with your companies if it would help you feel more confident. We’ve heard from some experts who checked in their companies (such as Google and Amazon) that management has an ambivalent stance to providing advice, as long as confidential information isn’t disclosed, of course.
If at any point you’d like to de-register, let us know at firstname.lastname@example.org and we’ll do so immediately.