Stealing from the (relatively speaking) super rich can be, in some circumstances, according to a sufficiently utilitarian moral framework. One could argue that's what progressive taxes are all about.

I admit it's hard for me to quantify the damage Microsoft's business practices have caused (any helpful links/sources?), but it's extremely difficult to imagine it being worse than not saving millions of lives.

Gates could be, with little imagination, be a modern-day Robin Hood. Stealing from those rich enough to be able to worry about computers and bit sequences, and then giving back the money to the truly needy in the world.

I have zero knowledge of ethics and philosophy, but in the grand scheme of things, when you consider humanity as a whole and ignore Silicon Valley, it's all good. Even admirable.