QVR

Can refuse liquidity removals. Whoever controls the hook controls the exit for LPs.

• sets its own fee per swap
  Dynamic-fee pool: the hook picks the LP fee at swap time. It can be 0 or 100%, and it can differ by direction, size or sender.
• can block LP withdrawals
  The hook runs before any liquidity removal and may refuse it. On launchpad hooks the hook itself is the only LP; for anyone else this is the exit being controlled by someone else.
• gates who can add liquidity
  Usually means the hook (or its launchpad) is the sole LP — no one else can dilute or front-run the curve. It also means you cannot LP here.
• observes swaps
  afterSwap without a delta cannot move value. Typical for oracles, points and accounting.