TCP was replaced in the data centers of certain FAANG companies years before this paper.
If they keep it secret they don't get credit for it.
How do you figure? The right decision is the right decision, even if you don't tell people. (granting, for the sake of argument, that it is the right decision)
Yeah, you get the benefit of secret tech (in this case faster networking) but people shouldn't give social credit for it because that creates incentives to lie. And, sadly, tech adoption runs entirely on social proof.