What's gained?

So I got a friend request on snapchat that sounded familiar so I accepted. Turned out it was a bot offering free sex if I just verified through a youtube link. I enjoyed looking at the pics that were sent but of course didn't click any links.
What do they get out of it? It said no credit card needed just a gmail addy.

What they're gaining is pretty much all your information cuz if you click on that link more than likely it's going to install a virus in your phone computer whatever the case may be to where they can get all your information credit cards login information Etc