I worked on a social platform some years ago, when it the population was somewhat 'mature' after inital growth spike, then the majority of new signups were fake. "Cleaning up" fake accounts was a big part of the job for the customer service team, as well as automation tools to suppor that task.

If visibility on your platform is somewhat commercially relevant, then you will have lots of people pushing fake accounts for various goals. And if you ignore them, then the more technically competent ones will set up offers to sell access to fake accounts on your platform, so that they will be abused also by actors who don't have the ability to create thousands of fake accounts on their own.