Compilation copyrights exist and are very light copyrights.
The viability of their claim i sadly can't talk about[1], but i can tell you what it would actually protect is
very small. It's basically only what they add to it (and they must add something to have a valid compilation copyright). To quote the copyright act:
"The copyright in a compilation or derivative work extends only to the material contributed by the author of such work, as distinguished from the preexisting material employed in the work, and does not imply any exclusive right in the preexisting material. The copyright in such work is independent of, and does not affect or enlarge the scope, duration, ownership, or subsistence of, any copyright protection in the preexisting material."
So yeah.
[1] Sorry. Once legal things that have an impact on the company i work for reach a certain point, I can no longer safely discuss them. I can tell you what the copyright act says, which is:
A “compilation” is a work formed by the collection and assembling of preexisting materials or of data that are selected, coordinated, or arranged in such a way that the resulting work as a whole constitutes an original work of authorship. The term “compilation” includes collective works.
I'll let others be the judge of whether what they do by compiling things into binaries meets the minimum standards to create an original work of authorship.