I've worked at a few startups, and with many more - and most of them did not require 150%. The two most successful were unicorns (networking, back in the day),

I've worked at a few startups, and with many more - and most of them did not require 150%. The two most successful were unicorns (networking, back in the day), and there we were barely past 100%. We worked mostly 9 to 5. Sometimes there was a push. The extra bit past 100% is what you get equity for. Moreover - it's definitely a choice on the part of the employee. Software developers are generally in high demand, wages are high, and there's no reason to go '150%' unless you feel the 'total package' is right for you. If service workers were required to put in 70 hours a week for 'no extra comp' then this would be a different story.