Literally things like stocks and real estate and cryptocurrency. Imagine Realpage or Bending Spoons.

Then that depends on the corporate structure. If you have personal liability, that means you net worth would be directly impacted by the negative. However, if its structured as limited, you could bankrupt the business without impact your personal wealth.

It depends how you separate your personal wealth and the business's

Unsure if you're being deliberately obtuse, but a consultant working for a sole proprietorship is technically making money off a thing they own but they're also still clocking in every day and doing actual work, typically for a third party.

It's a pretty clear separation between those who spend 30+ hrs per week working and those that spend the majority of their waking time "networking" (attending conferences, playing golf, traveling, whatever) with the occasional board meeting or office hours type meeting as the only part of that which looks like a regular job.

I think it's a bit of a continuum based on the degree to which someone is paid for work they do vs how much they are paid for their position and assets. I think if the business can keep running for a good while without them doing much and they aren't likely to lose their job for it, then they're more of an owner than a worker.

If you work and are paid by the hour you're not concerned do not worry