@tsubocchi >these people just pretend that GNU doesn't exist
Rather than merely pretend it doesn't exist, they do their absolute best to try to stop people from learning that GNU exists.

If that isn't possible, they try to claim that GNU is just a coreutils, or just a collection of tools and claim everything GNU is "fully replaceable" (there are only a handful of re-implementions of GNU software, that were only possible to write thanks to GNU and they all suck compared to the original) to downplay what was done and what is being done.