Yes, if minor have access to the internet in their own home. And they decided to join some social media then they need to change certain things. They have to move away with 18+ content. Or make something that block access to minor. (edited)
I do think they should put up that barrier, but it's weird how they didn't do an age restriction or anything like that from what I saw. Just straight to 13+ only
I know adult site have age verification even that doesn't always work. Because teenager have ways to bypass it. I know because I seen it happen many times when I was in my high school years. My friend was able to bypass the school internet security and I saw what they were watching.