This is the message shown on the DLC steam pages:
Notice: At the request of the publisher, Control - The Foundation/AWE is no longer available for sale on Steam.
https://store.steampowered.com/app/1538740/Control__The_Foundation/ https://store.steampowered.com/app/1538741/Control__AWE/
The base edition and the DLC/Season Pass of the game is still available on the Epic Games Store.
If you got the game from Humble Bundle’s Monthly, only way to get the DLC now is through their store:
UPDATE: We have read a number of comments raising legitimate concerns about the validity of this threat. We were contacted via a riotgames.com email by someone who knew private details about one of our devs which would be available via their Riot Games account.
In the interest of honesty, we have reached out directly to Riot Games support as some have suggested to try and get to the bottom of this.
No matter what, please do not harass Riot developers online. They would have no say in this either way
Update 2: A number of people have asked to see the original email. Here it is. I have redacted the names of our developer as well as their email address so any checksums may not match. Google shows this email as having a valid DKIM signature:
Greetings, people of the internet
I am one of the developers of the Chronoshift project. You might have heard of us as the team working on a “legacy server” for a 10 year old version of League of …
https://twitter.com/KAIJUTASTROPHE/status/1385630357391822851
^ video of the behaviour
just want to say though, other than this the game is running smoothly and (for now) stutter free for me.
Just immensely frustrating we have to manually cap the frame rate to make it playable. Square doesn’t have the best track record, but given how simple this would be to address I can still hope it’s sorted quickly.
If you like any 4x game at all I highly suggest playing it. The graphics haven’t aged well but the gameplay has and the factions are have really unique and awesome designs.