Has anyone tried a custom version of Brawl Stars for offline play?

Hi everyone,
Lately, I’ve been exploring some modified versions of popular games to try out different features without relying on official servers. I came across a version called Null Brawls, which seems to offer an offline Brawl Stars experience with unlocked characters and maps.
¿Has anyone here used it or knows about the pros and cons of using these kinds of APKs?
I’M especially interested in how they affect mobile performance or security. Any insight from those who’ve tried null brawls apk would be appreciated. Thanks!