Yes, you can host this solution on any shared hosting. At the end the website for the builder is simple HTML file.
Yes, if you obtain Extended License. You can make SaaS platform where you clients can make apps and pay for them.
You are able to create unlimited number of apps, for you or your clients.
Your clients will register, make app and pay to you via PayPal, card or wire transfer.
You are not able to offer this project as SaaS platform.
Offer this platform as SaaS solution.
There is only one user in the platform.
Multiple users can register and maker apps.
Yes if you have MAC computer. But there is solution for that also