There will be frameworks that build around your anonymous proof that allow people to block you across all platforms at your identity level. The default implementation of Worldcoin doesn't tie all your online accounts together, but I think many platforms would choose to use it in a way that doesn't identify you as any specific person, but does identify you as the same person across platforms.
With that particular implementation, if you spam on one account on one platform, people can block you across all accounts and all platforms. And I'm sure something like community maintained lists we have for adblockers will emerge.