[muawiyah]

That’s not “forced service” ~ it’s “caste difference”. Once you have an hereditary right to “draw water” no one drinks unless you allow them to have water.

[Harmless Teddy Bear]

Read the story. Other people drew water but the Gibeonites had to do it if the temple needed water. They did not have a right to draw water but the obligation to do it.

Saul tried to wipe them out during his reign which also argues against your premise.