This is certainly one way to spin this.
It doesn’t touch on all the other donations signal receives, including the major loan from Brian Acton. The OTF isn’t the only source of funding that signal has.
Signal will be fine. In fact now that the OTF have withdrawn funding it’ll probably shake off the weird take that Signal is CIA tech.
This doesn’t affect valve at all though. It’s borrowing their tech that they’ve made open source, and figuring out how to use it elsewhere outside of steam.
Actually, it’ll benefit them. More eyes are on proton and any fix will benefit everyone, including games played via steam.