It says you can use the library on your website if the website is open source. When does a WordPress website qualify as open source, or not? Or is the talk abou

It says you can use the library on your website if the website is open source. When does a WordPress website qualify as open source, or not? Or is the talk about gplv3 just trying to scare people because it's unclear to them what this requirement actually means? Not criticizing your business model, just curious. Thanks for the tool, liked the aesthetics.