Moderator gets message from someone saying they can help

I'm the only mod for a sub, 30k. I got a message from someone offering to help.

Something about building a small network of subreddit partners.

Said they drop a text post every couple days and in return offer weekly support for the mod team, usually $100+ depending on what makes sense for the sub.

They said they would need help with light post management but if needed they could do this.

What's the end game? Because this seems sketch