How is that to the contrary at all? 20% and not 100% with a ton of people just not playing the game at all, presumably

For counter-evidence, GOG exists after all, the platform would not be viable if everyone just wanted free stuff.

The real question is whether GOG would sell more if they one day flipped on the DRM switch. I think that's too complicated a question to predict though - GOG has a lot of smaller games, while Denuvos data is skewed by the high-profile releases that had a ton of attention before release (and thus people wanting to pirate them)