I don't think anyone is denying that skill is involved, but skill is often orthogonal to utility. Skill can be abused. Con men, burglars, and pickpockets all have skill. Malware authors have skill. Torturers have skill. I'm not saying sales is equivalent to any of those (OK maybe con men) but the point should still be crystal clear. What people are saying is that Fivetran hasn't succeeded in creating any value, and might even have destroyed value. When a big company "succeeds" by acquiring competitors they quite rightly get antitrust scrutiny because that's bad for competition and innovation. The principle doesn't really change for smaller predators.