Had a quick skim; it seems at a glance like someone from TorGuard badmouthed NordVPN on a youtube comment ( sigh ), so NordVPN apparently in response threatened to disclose "trade secret information obtained by NordVPN regarding TorGuard’s systems" it obtained via a hosting provider TorGuard used which is owned by the NordVPN people. This apparently involved some pretty sketchy stuff like sending people to the house…
Reading the parent pdf vs Nord's response [0] I'm slightly more inclined to believe Nords version of events here... 0: https://nordvpn.com/blog/torguard-lawsuit/
I used NordVPN for about a year a couple of years ago and I found their quality of service unsatisfactory. I've been using ProtonVPN for about a year now and I've been very satisfied. But that's just my personal experience and YMMV.