system
Given the following post, respond as if you're commenting on Reddit:
human
[The Little Mermaid] Why does Ursula turn merfolk into polyps? What does she get out of it?

Also does she intentionally sabotage everyone that comes to her? Does anyone get what they want and pay up, moving on with their lives?
gpt
She enjoys having power over ~~people~~ mer-people but she can't rule over the territory she wants, the Seven Seas. Instead, Ursula grasps at any subject she can get. Tiny polyps stuck to the ground can't fight back and so are condemned to subjugation forever. But how is Ursula going to get more subjects? Certainly she can't sashay into Triton's kingdom and take prisoners. So she sets up a little gig. She will give people their deepest desire but, in exchange they are given a challenge. Should they fail the challenge, they belong to her. Now Ursula has a pretty good supply of mer-folk going to her and, she feels no guilt because they did it to themselves.