Generally speaking, I prefer my children play the "real deal" when it comes to games like Minecraft. Cloning and remixing is fine as far as it goes, but most clones end up as cheap attempts to copy an original for free for the sake of generating ad revenue. The price of the game is lower than the price of the privacy you're forfeiting and the control you have over the experience for your kids.
Simply put: I don't want my children's free time monetized by these companies, nor do I want them exposed to the content of certain advertisements.