They're not coming out in favor of Chat Control -- they're coming out in favor of having some option where they can operate without violating the law.

The problem right now is that they can be held liable for distributing CSAM content on their services and, since April 3, they can also be fined if they try to detect that content. It's an impossible situation.

Now, I'm not claiming that these companies always have noble intentions. But there's nothing nefarious here -- they just want regulatory certainty: do X, Y, and Z and you won't be fined or sued.