Ask HN: How to sell HTML/CSS/JS design assets?

I've always worked on low level C++ applications where it is pretty difficult for someone to reverse engineer the compiled binaries. I was thinking about selling UI components, but I have this notion that anyone can just look at the source and copy it without paying. What are some of the ways HTML/CSS/JS assets can be sold? I was also looking at Tailwind UI and access to the actual components is only granted after paying for it. They simply show the pictures of the UI components. Another idea I had was to create a full SaaS app that lets people customize components and view source. Access to the website can be a subscription... but again, one can just pay for a monthly fee, copy all components and cancel subscription - there is no incentive to keep it going. Any other ideas? I come from a traditional closed software background so perhaps my way of thinking is too limited.