Well, not really saying it's bad in a moral sense or making a value judgement (though it does tend to be "bad" from a usability perspective), just noting what I've observed. And it applies even to things that aren't free, but which you pay for via some fixed initial cost.
For example, I bought Words with Friends a long long time ago, and for a while it was great. But now they've added tons of gamification features like powerups that bypass game rules, social, awards, etc... to try to get you to engage more and pay more money. Now, various awards screens pop up and waste seconds of my life after every move.
I just want to play standard Words with Friends with my wife like I have for the last 10 years. But one can see that folks like me aren't making Zynga any (new) money, hence the other inducements.