Launchers are a solution to DRM, not the solution. The way today's modern market is, it's understandable that some gamers have forgotten that there used to be games you bought directly from the publisher's website. DRM was done by asking you to sign into your account before launching the game, a lot of games still make you do this today. There's also the tried and true method of phoning home with a product key for DRM as well. There's no shortage of ways to be independent, very few companies are interested in doing so because Steam is convenient.