Dangerous?

They said Linux and open source is fucking cancer

And I'm pretty much quoting here - emphasise on just pretty much

Dangerous to profits. Please think of the shareholders!

Which was extra rich because Bill Gates was pretty active on open source forums getting help developing his early programs that made MS into what it was, as well as using his school's computers, which weren't supposed to be used for commercial activity, then when he was trying to sell his shit, he was outraged at all the people willing to give their software away for free. He's a personification of the pulling the ladder up after him image.

And he maintains that stance to this day, with one of the goals of his foundation (which he started at the advice of his father wanting to look better after the embarrassment of the anti-trust case where he looked completely out of touch during his testimony and didn't take much comfort that the government pretty much just backed down after winning and didn't force MS to break up) being that someone profits from the medical advancements they support. It doesn't have to be him, but he is vehemently against the idea that anyone just share ideas for everyone's benefit rather than people making profits from it.