[sparkie]

My understanding of copyright is that the method of linking is more of a vague guideline than any set in stone legal principle. Copyright determines whether or not some work is a derivative work of an already covered work. If you simply proxy access to a covered work through a different communication interface, but still depend on it for the essential functionality of your own work, you are unlikely to get a free pass to evade the terms of the license.

Only a court can make the final decision about whether a work is a derivative work or not. As developers we need to use our common sense to determine whether what we are doing is creating new or derivative works. We've seen from Google vs Oracle that it is not necessarily clear cut as to the extent a work is covered, which is why you should never assume that it's OK to ignore license terms for some perceived "grey area," and if you have any doubts, you should seek a professional opinion.