Yes, we do have a counter factual, they catch actual APT's they investigated the DNC hack in the 2016 elections and stopped many more attacks. You are utterly clueless in this area to make a comment like that honestly, I don't mean that as an insult but you are talking about a world they don't exist in as if every company has them. Most of their customers get them after getting pwned and learning their lesson the hard way. And availability isn't the only security property their customers desire, keeping information out of threat actors' hands and preventing them from tampering things is also desirable. I really hope you understand that in your hypothetical world without crowdstrike, threat actors still exist.