Summary
Rockstar announced today that they will be selling a Red Dead Redemption 2 Online Only version for $4.99USD from December 1st but the price will only stay at $4.99USD until February 15, 2021* it will then be bumped up to $19.99USD. It will be released on PlayStation Store, Microsoft Store, Rockstar Games Launcher, Epic Games Store and Steam.
Quotes
My thoughts
I haven't seen Rockstar do this before maybe they might do it for GTA 5.
Sources
https://www.neowin.net/news/rockstar-will-offer-red-dead-online-as-a-standalone-game-priced-at-499
https://www.rockstargames.com/newswire/article/61801/get-red-dead-online-as-a-standalone-game-on-december-1st