Out of high-tech domain, I was thinking that my grandma could sell the jam she makes - but she can't sell it legally if it's produced in her own house - no matter how low is the production. Maybe just at some kind of farmers market, but that is iffy.
If I want to invoice some custom development for software, I can not do it as an individual. I either need a BS in Compute Science or setup a SRL.
The romantic view of starting out in the garage is quite illegal in these parts.
You need to spend a lot just to test a business idea. And what yous spend is not actually investing in the business, but just wasting time and resources with the bureaucracy.