I'm sure they did that too, like any other major company sued by a troll. This isn't an either/or situation.
Jengo draws from many, many people across the industry. They can surface all sorts of prior art, not just earlier patents, and they know where to look due to their experience.
As I said, every large company that gets sued by trolls pays patent search firms to find prior art. I can't imagine that Cloudflare didn't do the same. Why wouldn't they, there is a lot of money at stake? They added to that through the search program because the yield from patent search firms is often poor.
And, note, this strategy has worked pretty (cost) effectively for us before:
https://blog.cloudflare.com/winning-the-blackbird-battle/
But you’d suggest we do what everyone else does and hire expensive “experts”? K. Good luck with that.
Oh, forgot, that’s your profession… expensive expert. Carry on.
Also: I'm not saying that patent search firms are perfect. Albert Cory had a comment here about how the quality of search firms varies dramatically. But I do think that searching is a skill which can be developed. Many of the examiners I worked with at the USPTO were outstanding searchers who could find information in their area very quickly. It can be hard for someone looking to purchase patent search services to know who is good, unfortunately.