Sure, if you have a full-time tech job and also a "full-time" side gig running a pottery business (or doing some unrelated consulting/writing on the side), very few companies are going to have a real issue. (If you aren't really doing a good job on your tech job that's between you and you employer.)
But these sorts of stories are basically all about people having two full-time tech jobs and time slicing them--including possibly outsourcing some of the work.
ADDED: And maybe it's just a function of the sort of job I have but what are these extremely well-paid jobs where you're some anonymous drone where a wide range of people in the industry aren't very familiar with who you work for.
