"For an adult I wouldn’t want to restrict the amount of time you are on a platform but for different ages it might be right to have different time cut-offs"
I think these days schools are making much more of an effort to teach children about online dangers and social media, and perhaps it's even working! On the other hand, adults seem to be too busy trying to climb the ladder in a global popularity contest to care.
I deleted my Facebook account over two years ago now and my primary motivation for doing so was that my adult "friends" are completely and utterly insufferable on social media. I feel like a lot of the "think of the children" attitude is just projecting.