Don't worry, the dancing bunnies will find it's way to be clicked.

I doubt the given how tech savvy the kids are these days, how many time would they need to find a workaround against this.

I still think that the best way to protect them is to gain their understanding why it's not good for them, and allow them to see these things as they hope they'd lose interest themselves later.

Hiding these websites away will just make "visiting these sites" more attractive to them.