They migrated to a different, country, that is part of the EU. Once they are legal there, they can move to anywhere in europe without problems.

Crossing a breakwater and going home 30 minutes later does not make them legal EU immigrants. It was an overblown news story that only have been believed by someone who has never been to the region, like so much news today!

Most of these people aren’t from Morocco, so they already were migrants before even making into Ceuta, which is Spain, hence yet another country.

Where did you hear that? Ceuta is entirely surrounded by Morocco and all of the people who moved into Spanish territory in Africa for 30 minutes did so by coming from Morocco. The confusion surrounding the geography there is... confusing!