Anybody can download and install it. It takes a lot of knowledge to support it. Support is where the money is.
You could hire away a bunch of folks for $34 billion.
And the way these tech takeovers usually work, a bunch of the guys at the takeover target are going to be gone within 18 months. Sure, some of them can have their knowledge extracted before they flee or are discarded, but 6 figure signing bonuses could probably reach the same result a lot cheaper.