[aldousd666]

Copyright doesn't cover the results of code, nor the methods used in the code, techniques and algorithms aren't covered by copyright. Period. Copyright applies to 'the work'. If you don't copy the source code, it's not covered.

[scosman]

They copied strings, and visual design. Both of which are work, both of which are covered by copyright.

[kube-system]

Designs and strings are only sometimes covered under copyright.

The elements of a design that are ornamental, utilitarian, or a general look and feel are not covered under copyright but would be covered under a design patent if one exists.

Strings are only covered under copyright if they are a sufficiently original work of human expression. Simple informational messages generally wouldn't qualify.