Virtually all Linux distros are free (some try to push support contracts which include a "premium" version of the distros).
My suggestions are Linux Mint for most devices, and Pop_OS! for nvidia card desktops or hybrid laptops with nvidia cards.
It's funny. I received the warning earlier this morning. I had never posted on T_D (I don't post much of anything anywhere on Reddit) but I did upvote T_D posts like a madman.
So a little while ago, while bored, I responded to the automated warning with:
"Senpai noticed me!
Even though the message says this account isn't monitored :("
A couple minutes later, I received another message about my "suspension or warning". Though I'm guessing it's just about the warning and it just happened to coincide with my sending the fun little rebuttal. I don't appear to be suspended, though I don't care enough to try and post anywhere to test.
Thanks for the explanation!
(I still don't understand...)