Which license for custom nodes?

Hello,

as there are non-commercial custom nodes are popping up I am wondering what is allowed here?
see
https://www.gnu.org/licenses/gpl-faq.en.html#GPLPlugins

> If the main program dynamically links plug-ins, and they make function calls to each other and share data structures, we believe they form a single combined program, which must be treated as an extension of both the main program and the plug-ins. If the main program dynamically links plug-ins, but the communication between them is limited to invoking the ‘main’ function of the plug-in with some options and waiting for it to return, that is a borderline case.

I am not an expert on these things to be honest but I discovered several strange license usage for some ComfyUI nodes in the past.
So what does it mean here for ComfyUI custom node license? As I understood it correctly we have a "borderline case" here so it should be fine having non compatible license here?
Thank you