A representative for Epic Games has confirmed that an email inviting people to participate in a Fortnite Android beta is a phishing scam. Gamers have been warned not to share any personal information if they receive such an email. Also, Fortnite's guest villain, Thanos, has had to be nerfed due to player feedback in regard to his destructive powers.
https://www.notebookcheck.net/Epic-issue-Fortnite-Android-beta-scam-warning-and-Thanos-gets-nerfed.302958.0.html