They are designed to be addictive yes, but that doesn't make the user non-complicit. It's easy to stop using these products, especially if you have other interests in your life.
Well, the definition of addictive is quite literally "cannot stop doing once you have started" (Cambridge dictionary), so not really.
I do see your point, though, I grew up without social media nor internet so I have plenty of offline things I like doing. But you have to consider that most of these young kids grew up with social media and mobile games as their primary, and often only, source of entertainment. Their addictive nature makes it really hard for them to find other interests in life, especially considering that parents often leave their kids on the smartphone to keep them quiet.
