Because... you are terrified that you might manage to figure out how to access such content, and need to make it extremely difficult for you to do so, even on purpose? (I clearly don't understand.)
No, because I want to be able to choose to interact with people who are fine with there being barriers to similar types of content.
If some feel they have a compelling reason to straddle both, they still can, so it denies them nothing, but sometimes even small extra barriers helps set a tone for communities.
If some feel they have a compelling reason to straddle both, they still can, so it denies them nothing, but sometimes even small extra barriers helps set a tone for communities.