@RoxyRiku94 In addition to that, if you're playing as Mongols, you could put trading posts in a bunch of cities immediately, and then have some massive trade routes long before you normally would.

While being a negative Suzerain bonus overall, I think one can exploit the 'Cancel International Trade Routes" penalty by sending Amani to Tortuga to become Suzerain and then withdrawing her after cancelling all the Trade Routes sent.

Makes it for wacky strategies like getting Envoys with 'Owls of Minerva' by repeatedly renewing your Trade Routes to City-States, or resetting your Trade Routes after sending a Trade Route to a City-State for a quest (for example when playing as Tokugawa).

Your city states' mods make games much better, especially the ones which has negative effect on the suzerain is really interesting.
I think it's the only one negative city state which can be used in a strategic way.
Cancelling all the international trade routes can let the player reassign them immediately.