What are the limitations of the free license from the perspective of someone using "Free" package on a website (comercial or not)?

The "free" license seems permissive enough for commercial (or non-commercial) use and I while there are "premium" components, these could be trivially be re-created using the "free" packaged css/js.

PS. I'm not talking about "repackaging" the code in some secondary tool/template/theme, but to use it on a website like an e-commerce website.