In our industry it seems we could but how many do?
Have you? If so what is bringing in your side income?
The study is actually quite insightful if you read it for what it is and not what you want it to be.
I have also found this video to be quite insightful : https://www.youtube.com/watch?v=NF5H7ch2Ngg
They mostly helped me learn/grow on to better roles and learn more about creating businesses and machine learning.
My main income so far was mostly powered by house flipping/stock (canva)/work but i recently left to persue running my own AI business.
I now made/run https://text-generator.io an API for devs to generate text/code which recently became profitable.
I find with careers in general it's best to be the fearful one feeling like the perpetual imposter around greats, taking too many risks, moving around what you do a lot to build your skills, i received lots of negative feedback about ideas before e.g. "its impossible to predict the stock market", "if your predictions are so good then why arent you just keeping it to yourself", "why compete with Github copilot on generating code?" "arent they so good already", "isn't it too ambitious", "why compete with OpenAI", turns out there's lots of potential customers who are in much different situations than ones giving negative feedback, receiving the negative feedback helps you feel scared and know your doing something against the status quo.
I made some massive "blunders at face value" like leaving Canva and blowing lots of potential stock to go learn about using Machine Learning for generating text at a startup, blowing lots of money developing stock trading algorithms etc...
While taking the appropriate amount of risks to have a fulfilling life, you'll find it feels like a rollercoaster filled with ups and downs that may feel like epic fails but are really epic lessons.
If you’re not in FAANG or equivalent, work on getting there. Then if you’re not L7+ work on that.