Not the same thing as those mentioned in the article, but I went self employed because it became increasingly difficult to find any salary progression in full time employment in the UK.

Several years on and I make in 3 days a week what similar senior London based full time employees make in 5. There’s no work scarcity either.

It’s like the the money is there, but workers in the UK are just used to being underpaid and so they put up with continually just getting by.