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Valve Releases Team Fortress 2 Full Client and Source Code
(gamerant.com)
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I'd imagine so, it's an d game, not sure how much they're still making in it (not much I'd guess given the rampant hacking concerns and protests I've seen online)
So... Why not do the cool thing and open source it for the community to maybe build something cool in it (hell I'm SURE someone will make some neat stuff)
They finally addressed the hacking/botting issue.
Usually valve releases boxes with skins for summer, halloween and winter. I dont know if some are made by valve or all are community created with a cut for the creators. But it seems a low effort way to keep making money out of an old game.
And TF2 is still extremely popular, both with high player numbers, active content creators, community tournaments and the like.