According to , V-Bucks can only be earned or purchased through official channels:

: You can buy V-Bucks directly in the Fortnite Item Shop or via authorized retailers like GameStop or Amazon . What to Do if You Downloaded the File

: The .zip file likely contains executable malware that can steal your personal data, passwords, or lock your computer for ransom.

: Advancing through levels in the Battle Pass rewards you with V-Bucks.