Will that change because on the Ps4 it is not a beta.
On the PC it is also early acces. That's where it is, too, until the world is done
Moin blade
Unfortunately, I have to correct the above comment. Fortnite is still in beta because you have not made a public release yet. This is also called "Perpetual Beta". The reason why you do not have a public release is because the game is still very unstable and it has a lot of bugs.
In a released game, it is believed that it has few bugs and the game is complete. You will not be doing weekly updates, for example. The map. Usually there's a new version with a big update + 30GB (of course it depends on the game).