CS:GO, they did. As well as CS the game, but not the mod. Also people who made original CS are all employed by Valve, so they weren’t just part of the company at the time.
Even CSGO was originally made by Hidden Path. CS2 and CS:S are the only ones fully made by Valve (+community maps/skins). Regardless the series itself was not made by Valve, they hired the original mod team after it was already a popular HL1 mod.
CS:GO, they did. As well as CS the game, but not the mod. Also people who made original CS are all employed by Valve, so they weren’t just part of the company at the time.
Even CSGO was originally made by Hidden Path. CS2 and CS:S are the only ones fully made by Valve (+community maps/skins). Regardless the series itself was not made by Valve, they hired the original mod team after it was already a popular HL1 mod.