That's because A) big companies that use it don't really like bragging about their security tooling, lest it be used to better profile their infrastructure by attackers, and B) it's basically enterprise-only and insanely expensive.

Source: worked for a large enterprise company that used it, and I loved it. Phenomenal tool, will be a shame to see it die (or at least its non-GCP aspects wither and die) under Alphabet's ownership.