No need to look that far.

Palantir sells software for analyzing data, like Excel but on a large scale. If "Chat Control" passes, they will need software to analyze the data they collect, which is exactly what Palantir sells. It is just business.

I don't know about Thorn but it looks like the same: they sell software that may be of use for implementing "Chat Control".

"It is a just a business" is crazy to say if your founder was Peter Thiel and you ostensibly merged already halfway with the operating goverment (US, DoD)

Thiel also has a religious angle, where he thinks himself a god and imagines a perfect society where every human is watched at all times