I definitely don't trust NordVPN in particular, they advertise their "military grade encryption", and I have no clue who runs it.
[1] https://www.reddit.com/r/ProtonVPN/comments/8ww4h2/protonvpn...
What other VPN would you trust? Mullvad, absolutely no clue who runs it. Private Internet Access had claims about logs proven in federal court at some point in the past, but I really still don't trust it.
Running your own VPN is one of the best options but you almost completely lose the relatively reasonable degree of anonymity that VPN providers serve to you. Depends on your objectives.