It's not the mere fact of their existence that would drive people away, necessarily. It's that as other high-activity users leave, your recommendations are eith

It's not the mere fact of their existence that would drive people away, necessarily. It's that as other high-activity users leave, your recommendations are either gonna end up being NSFW... or empty. At that point, if NSFW isn't what you want, you'll find it distasteful and leave. It's probably a mild effect right now, maybe not even observable if your Twitter account is already well-established. But as Twitter continues to lose members, it will become more pronounced.