If you are interested in this topic because you are concerned about your own account security, you should focus on these legitimate steps:
Use services like Have I Been Pwned to see if your credentials have been leaked in a past breach. NordVPN .loli
Instructions on how to bypass bot detections (like CAPTCHAs). If you are interested in this topic because
This is the single most effective way to stop "account checkers" using .loli files, as the script cannot provide the secondary code. NordVPN .loli
Credential stuffing only works if you reuse passwords across different sites.
NordVPN and similar services actively monitor for automated login attempts. Using these configurations often leads to the immediate blacklisting of the IP addresses involved. How to Actually Secure Your NordVPN Account