It's a case of voting with your wallet for most people. There are degrees of DRM that people are willing to put up with; where some people would rather go for DRM-free games on GOG, others are happy with one launcher like Steam and some others will accept each game launching its own launcher from within a meta launcher/store front.

To be honest it's a matter of personal preference and I try to be in the 2nd group but I don't mind what other people do. Again, personally, I dislike the idea of being apathetically brow beaten into signing up for dozens of services for the convenience of companies which provide no utility to me. Sometimes these launchers actively harm the experience by disabling steam launch options or bricking the game completely if you don't live in the right country.