If you cannot pay, use legitimate free tiers from reputable privacy-focused companies (such as Proton VPN) which offer free basic plans funded by their premium users, rather than relying on stolen data.
A "combo list" (short for combination list) is a text file containing pairs of usernames or emails and matching passwords. nordvpn--Freeuhqcombo.txt
One might wonder if the "freeuhq" (Free High Quality) part of the keyword implies a free version. It is crucial to clarify that . If you cannot pay, use legitimate free tiers