Just to underscore your point: I'm an engineer at Wikimedia, and I worked quite closely with Brett, the author of the blog post. As a small nonprofit operating a very popular site, we're accustomed to being approached by salespeople camouflaged as altruists, and over the years we've developed a pretty good nose for that sort of thing. The people on the HHVM team with whom I interacted were palpably genuine and nice, helping us out at odd hours of the night, and asking for absolutely nothing in return. They're wonderful people, full stop.