No reliable bot exists for more than a few hours. However, @premium_accounts_bot (varies) sometimes posts fresh Rapidgator logins. Use at your own risk and never use your real email.
Many "premium checkers" require you to log in via a web form before giving you a database entry. That website captures your —including your own real premium logins for other services. JDownloader 2 Premium Database Premium Account
The holy grail (a free, unlimited, safe, auto-updating premium account database for JDownloader 2) does not exist. But the realistic, affordable alternative (debrid services) works perfectly and lets you get back to what matters: downloading your files quickly, safely, and automatically. No reliable bot exists for more than a few hours