High tech CEOs aren't particularly known as big givers to charitable causes. Some of this might be perception (Steve Jobs, for instance, gave secretly) but there are plenty of high tech winners who feel that "changing the world" is more than enough.
High tech CEOs also seem more likely than execs in other industries to be fans of Ayn Rand, who rather famously said: "My views on charity are very simple. I do not consider it a major virtue and, above all, I do not consider it a moral duty."
There are, however, some big (and I mean really big) exceptions to the "high tech CEOs are cheapskates" rule. Here's an infographic showing who's giving the most to make the world a better place: