A publicly available "premium database" is a myth. You cannot get a master file with working credentials for Rapidgator or Mega for three simple reasons:
Users can set rules to prioritize specific accounts or prevent the software from falling back to "Free-mode" if a premium account encounters an error. Multihosters: Services like Premiumize Premium.to JDownloader 2 Premium Database Premium Account Premium
Interrupted downloads can usually be resumed without starting over. Bypassing Wait Times: A publicly available "premium database" is a myth