I think it has less to do with social barriers and more to do with carelessness. Parents will give their kids video game console and tablets without thinking to turn on any sort of parental controls. Additionally there are any number of YouTube videos that easily findable without any actual effort that will show you the entire Robux purchasing process which means children who you would think might be to young to figure out the process end up figuring out the process. Finally, a lot of people don't go over there CC bill unless things look really out of sorts.

I don't think this is a major break down of society type of thing, more of something modern parents need to be aware of since making a lot of ill advised app purchases seems to be becoming one of those things all children end up doing at least once before being taught not to (or finding out the consequences of disobeying).