I'm really curious why employers care at all about your past employment. To me it always seem just a an advertisement if that. How I and my colleagues got hire

I'm really curious why employers care at all about your past employment. To me it always seem just a an advertisement if that. How I and my colleagues got hired and makes 100% sense to me: 1. Skim their github 2. Ask questions about their stuff on github or some past work they shared 3. Give them a realistic task and a week to solve and push to github. Evaluate it - very easy to gather the motivation and skill. 4. Evaluate performance for a month or two. If they say what they are it will appear immediately. Of course some psychopathic companies want you to solve shit on the spot, which is kinda fine if it reflects actual work culture.