Valve blocked CS mod launch on release day. Devs investigate
The release of Counter-Strike: Classic Offensive failed to happen due to Valve, forcing the mod's developers to investigate.

The creators of the anticipated Counter-Strike: Classic Offense modification must investigate after Valve blocked the mod's launch. The modification might eventually make its way to Steam.
According to the project developers, this was said in a statement released a month after the mod card was removed from Steam in January. This morning, Valve Corporation contacted the team and expressed concerns that their creation may no longer meet the recommendations and rules outlined in the Steam user agreement.
In light of these reservations, the Classic Offensive team decided to conduct a detailed examination of the current version of the modification to ensure that nothing in the game code violates the rules of Valve's platform (via PCGamesN). No details were given, but one of the developers hinted in a separate post on X that it was about "redistribution," possibly in connection with the presence of files from the original release of CSGO.

CS fans are disappointed with this information. The mod has been in development for over 8 years and even gained approval from Valve as part of the Steam Greenlight program. Preventing the project from launching on its release day (Classic Offensive was set to debut today, March 12: according to the developer's post) understandably angered players.
Nonetheless, some players note that Valve hasn't (yet) ordered the cancellation of the project, as was the case with other fan-made works. The Greenlight initiative itself has long ceased to exist, and the "green light" from the company may be outdated in the context of the current Steam rules.
It's possible that following the team's "audit" of the code (and possibly removing any questionable parts), Counter-Strike: Classic Offensive could finally be released on Steam. This is even indicated by the message from the modders, asking players for patience.
The question is, how long will we have to wait for confirmation of the further fate of this modification?