"Free for the month"

Hi, guys!
I found in “Unreal engine” (in Epic Games Launcher) paragraph “Free for the month”.
I wonder, this means that after a month it will become paid, but will it remain in the library forever, or will it disappear from the library after the expiration date and you have to buy it?

It will stay forever in your library and you can download it anytime, same like games in services Epic Store free game every month and like Playstation Plus free games it works same way