4 points
I could basically buy anything that I get on Steam, on either Epic or GOG. Their market share is not why I buy games on Steam, I gave you those reasons already.
I do not run Windows because its a shitty hostile environment that contractually prevents distributors from providing an optimised interface for gaming. It inserts adverts into every section, and even Windows users unironically complain that Windows Update is malware.
-3 points