Epic Games removed the Unreal Tournament series from Steam, but promised a free-to-play reboot. It seems the plans were cancelled

Unreal Tournament was once available on Steam, but Epic Games decided to pull the games from sale. It was announced that one game would return in an updated form

Epic Games removed the games of the Unreal Tournament series from Steam. Around that time, a page for the free-to-play Unreal Tournament 3 X appeared.

It looks like the plans for Unreal Tournament 3 X have been scrapped. This opinion was voiced by Wario64 after checking the SteamDB entry: the previous description promising a free-to-play model, along with cross-play with the Epic Games Store and GOG, was removed.

@Wario64

This became yet another reason for the Unreal Tournament community to mourn. It is not entirely clear what happened to Unreal Tournament X.