I think this is a bit shortsighted. The poster wasn't saying steam was evil "now" rather than steam could easily turn into something evil. Which, in reality, it can.
Take Hulu for example. The website started as awesome, then they added ads you could skip, then they changed it to occasional unskippable ads, then frequent unskippable ads, and now they're transitioning into a pay model. Lame.
Are you saying this same sort of thing can not or will not happen to steam?
Once the company has the user base, it has the leverage to do these things. Furthermore, once you have bought into steam, you're bought in for life. If you ever want to play a game that uses steam, you must have steam. They know this, and its genius on their end. For instance...
Lets say a couple years down the line, steam starts charging for access. You might come back and say "hey, well there are other companies I can choose to use, that's the free market baby!" But unfortunately that's not the case here, because you've already spent you're money on games that use steam, so you can't just up and leave without completely losing your investments. The other poster was right, they can literally hold your games for ransom at that point. What are you going to do about it at that point? There is nothing you can do except lose it all.
Or, you could demand that games released now not require such a feudalistic dynamic between gamers and suppliers.