If you're reading this and thinking about working for an early startup, don't. Best case, you make some douchey boss a few million dollars and worst case you lose years of your life making vaporware. Find a real job with stability.
While 10% is obviously low for what amounts to being a cofounder, I invite you to start a startup with just a product and see how far it goes. You might change your mind on the “just sending email” part.
I think 10% could be a decent share for a CTO even at ~seed if the CEO brings great access to capital and users, and outstanding product management instincts. The problem is that this is seldom the case. What I see most often at pre-seed is a CEO that brings a product idea that is all in their own head (and not in the users’), zero idea or instincts on real product management and little else.
How do you measure if you are good at ideation, coding, architecture, and the myriad other skills required to run a startup? Unless you are implying that a startups success has little to do with the founders.
And coding and architecture has little to do with a startups success - and I say this as a “coder” for 25+ years and an “architect” who gets paid decent money at BigTech working with other companies helping them design their cloud architecture.
I think the entire industry forgot about startup risk during COVID, and unfortunately it is coming rushing back now with the changing environment....