It's not an exception at all. People get promoted all the time. Most people I work with have been promoted at least once since joining the company, some multiple times like I have.
Based on my anecdotal experience and the people I've known in industry, job hopping is way way way easier than getting a promo if you're trying to maximize salary. Mine has doubled after a few job hops.
Right because “working for yourself” is likely to lead you to the same profit as even the comp of a mid level employee at any of the BigTech companies.
