Vinesauce’s Vinny got one as a joke. He’s made full streams being baffled and trying to understand the trend (one of them with a lengthy tour from a “lore expert”). And of course being amazed that this is probably the only thing for what the G-man face is known to a lot of people now.
But he’s got a segment where he opens silly collectibles and blind boxes, so of course he had to get that shit. And uses it as a prop once in a while for a convenient flush sound effect.
Lots of the assets (most notably face models) are from Half-Life 2. The reason they’ve been used in this skibidi shit is because the original videos were made with either gmod or Source Film Maker, not sure, but in any case, in the Source engine.
And of course the easiest way to find models for this is to take them from Source games. If you just started playing with gmod, that’s probably what you’d be doing, building silly stuff with assets from your source games.