Apocalypse has had a very interesting last few years in the X-Men comics. To say that fans weren't expecting his face turn is saying something. Apocalypse's decree that Krakoa was strong was a huge change for a character who heretofore had tried to destroy many of the mutants there for being weak. Many readers figured Apocalypse was going to betray the X-Men at some point, especially as more was revealed about Arakko and the family he had there. However, Apocalypse not only kept the faith, but did everything he could to make the people of Krakoa stronger.
Source：https://www.cbr.com/xmen-apocalypse-krakoa-greek-name/
