If you have 12 hours of idle time, there's a fantastic video on The Phantom Menace that really added to my appreciation for it. Bread Circus is amazing
And? This is like looking up hammers that don't leave fingerprints on the grip so you can get away with murder. The tool itself isn't the issue, the motive is, as well as the person responsible for using it.
Valve has objectively done far more good in the gaming space than any other company so I would say yes, their achievements are worth celebrating even if it is monopolistic. They've proven to be trustworthy for the time being, unlike other companies.
Everything is derivative