If they use unmodified Linux, then they only have to provide (a link to) the source code to that kernel on request. No source code is required for proprietary add-ons, unless they are kernel modifications.
The GPL also does not state that the source code should be easy to find. In the early days, one had to write a letter, send it by mail, in hopes of getting a tape or CD-ROM with the source code. For which you then had to pay as well.
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And as usual... something that looks like it uses Linux, but has absolutely zero Google search results on how to obtain the GPL sources.
We desperately need some large ass legal fund that takes the GPL violators to court.
If they use unmodified Linux, then they only have to provide (a link to) the source code to that kernel on request. No source code is required for proprietary add-ons, unless they are kernel modifications.
The GPL also does not state that the source code should be easy to find. In the early days, one had to write a letter, send it by mail, in hopes of getting a tape or CD-ROM with the source code. For which you then had to pay as well.
What could be the potential risk of not being compliant to the software license at hand e.g. let us say we would sue a GPL violator?
There have been several trials, all of them won, I think
https://gpl-violations.org/about/