Mullvad had released a public statement in relation to this information in a blog post on their website two days later, also mentioning that it was their first time that their offices had been searched by authorities.

The investigation involved a blackmail attack that targeted several institutions in the state of Mecklenburg-Western Pomerania which revealed IP addresses that were traced back to Mullvad's VPN service.

This was done due to the use of port forwarding for illegal activities, with this causing interference by law enforcement, Mullvad IP addresses getting blacklisted, and hosting providers canceling their services.

[3] Complementing its use of the open-source OpenVPN and WireGuard protocols, Mullvad includes "industrial strength" encryption (employing AES-256 GCM methodology), 4096-bit RSA certificates with SHA-512 for server authentication, perfect forward secrecy, multiple layers of DNS leak protection, IPv6 leak-protection, and multiple "stealth options" to help bypass government or corporate VPN blocking.

[3] Mullvad provides VPN client applications for computers running the Windows, macOS and Linux operating systems.

iOS and Android mobile operating system users can also configure and use built-in VPN clients or the OpenVPN or WireGuard apps to access Mullvad's service.

[20] Providing personal information used to identify users such as email addresses and phone numbers is not required during Mullvad's registration process.

[21] For anonymity purposes, Mullvad accepts the anonymous payment methods of cash and Monero (payment for the service can also be made via bank wire-transfer, credit card, Bitcoin, Bitcoin Cash, PayPal, Swish, EPS Transfer, Bancontact, iDEAL, Przelewy24, and vouchers sold by multiple resellers.

[28] Mullvad has been actively campaigning against the EU's Regulation to Prevent and Combat Child Sexual Abuse (a.k.a Chat Control), which would require service providers to scan all users' online communications, even encrypted services, arguing that it would make all methods of online communication viewable and thus not private and not anonymous.

A PC World review, also from October 2018, concludes, "With its commitment to privacy, anonymity (as close as you can realistically get online), and performance Mullvad remains our top recommendation for a VPN service".