How are randomized card packs still legal?

[A Black Falcon]

I have a shoebox down cellar full of the baseball cards I bought as a kid (from the late '80s to early '90s); that was my only foray into buying randomized-stuff packs, and I never did like it all that much. Sure, there's that sense of 'what will I get', but more often than not, what you get isn't worth it. And so I have stayed away from all such things since. I hope to keep things that way, it's an annoying way to buy things.

As for how they are legal... I guess that is a fair question, isn't it? I mean, it's basically like legal gambling... it does seem like there could potentially be a legal issue there, but somehow it's entirely fine. Maybe it's that you don't win money straight-out, only rarer stuff?