I know its easier than ever to dunk on how terrible reddit has gotten, but honestly? What is this? How is is safer to deliver this content to kids viewing reddit on a tablet or PC or in the app? Why even create the bs excuse?
They could just have easily told the truth an displayed a message like “Content is limited. Open in the app to view.” It’s still a jerk move, but at a minimum its honest.
I hope you aren’t letting your kids smoke Marijuana. That is really, really bad if you are.
As far as tablets go you just need to be careful of how and when they are used. It also depends on the age of the child. They best answer is almost always education.