Yeah, but what happens if it's not worth 1 $ anymore?

My understanding is limited, but naively:

  - I give them 10 USDC
  - They convert it to 10 BUSD
  - Price of BUSD falls to 0.5$
  - I want my 10 USDC back
  - They have to sell 20 BUSD to get 10 USDC
  - They have to generate 10 BUSD ??

I'm sure this is not how it actually works, but you get my point.

Also, one could argue that if the BUSD price drops against the dollar they should have more BUSD ? Or how does that work? :)