Seems a bit lopsided though; I wonder if they are only considering selected stock markets or something.
[0] https://hellosafe.ca/en/investing/broker/stock-ownership
If you have enough excess income that you can build wealth in assets/investments until you become financially independent and no longer dependent on selling your labour, you're white collar.
If you don't, so you're condemned to work forever (apart from state support), you're blue collar.
It has never been about how much money you make.
The overwhelming majority of self employed professionals I know (electricians, mechanics, plumbers) make way more than the average white collar worker (southern Europe).
Just to make it clearer: my SO, which works in governance of a major italian bank, makes way less than her brother painting walls.