Great product. Do you not worry about someone copying your code and selling it as a saas? I am selling premium Wordpress plugins and it’s incredible how many people try to purchase my plugin and then offer it as a saas
It's always a concern for me. I'm looking for ways to detect such cases and that way terminate the licenses, which will prevent the user from downloading any release. Another approach that may work (just an idea), is to secure the documentation and allow access to it to logged in users with one valid license at least, but this has some disadvantages like the affected user experience.
A legal notice is always an option.
Get it to market first, holding the market is marginally less difficult when you move first.