A non-trivial amount of their ARR is still from Valve-made games. Counterstrike still nets a bit over 1b per year from just case unboxings, and Dota is in the hundreds of millions. I wouldn't call 8-10% a margin of error.
https://box2d.org/posts/2026/06/announcing-box3d/#valve-to-t...
Yes I know Valve makes money selling games. They don't make games.
Dota is live service game, getting major patches each year. Patch notes for version released 3 months ago: https://liquipedia.net/dota2/Version_7.41 I don't think there's any reason for Dota 3, ever. Any change could be just a patch.