It's pretty easy to avoid the issue of other kids tearing down your Minecraft stuff... just create your own world, and either play in it by yourself, or just invite your closest friends in. It doesn't cost anything to create your own world. My DD has hundreds.
It's quite possible it's changed in the few years since my son was using it. It's also possible he hadn't figured that out at that time. I just remember he getting upset about it. And that one thing that helped was a friend who purchased his own space and invited my son to join. Perhaps there are differences between the free spaces, and those that cost money.
