While I appreciate the answer given earlier, those of us who value privacy and desire to know who/what/when/how our systems work... want a lot more.
The suggestion of putting those pubsub ip's behind a legit domain name is a move in the right direction. And the DNS hit isn't good enough of a reason to forego transparency). Even now, personally, I see my Plex install unendlingly sending data to three IPs not on that pubsub list. Surely, the Plex wizards can understand how its not cool that my system is contacting what appears to be a shared server at linode... and plex can't even tell me that is legit or not.
diathesis stated earlier that he had less concern with the 'named sites'. I don't share that level of comfort... and others need to understand that you have no ability to understand what data is being sent from your system (the one with your home movs, photos, pr0n, everything) to addresses at amazon's rent-a-server (aws) or x.members.linode.com (plans as low as $5/month).
We need transparency.
- A plex pass lifetime member