Anyway, how are you going to pay engineer salaries and 24/7 support staff on a $5-10/mo product? Not to mention, you'd be hosting someone's critical infrastructure so they will have a meltdown when you inevitably make a mistake. How long are you willing to burn money before you've reached a scale where it's profitable?
It's paradoxical how all the money in tech goes to the most useless things that are a net drain on society (social media, ad tech, etc.) and we're willing to pay less for the most important things than we would for a cup of coffee.
At the prices people are willing to pay for SCM, it really has to be a complement to some other product you're offering or part of an integrated suite. It's most likely a dead end on its own.
I guess you could do it... but why? There are a thousand ways to make more money with fewer headaches. I wouldn't get into this business myself and I wouldn't fund someone else either.