ReadySetGo's world is a cartoon world, yes, but, it is not linked to other worlds including artwork of other videogames/cartoons so, no, it cannot spread, if there WAS a paradox it would be contained in one world

Which could happen, expect the paradox can spread to other worlds.

Stay tuned to see how it goes >:)

That..... couldn't happen unless there was a time paradox and a black hole at the same time

The timeline could create a reverse universe that make the world cause a Blackhole of Universes.