They may be basing their collection on ‘legitimate interest’ for instance.
I don’t think anyone is in a position to predict these things but I’d bet they have a pretty good justification there for IP collection given the product they provide.
Also in the original thread someone quoted this cool tidbit from their ToS .[1]
> Special Note to International Users. If You are accessing the Services from the European Union, Asia or any other region with laws or regulations governing personal data collection and disclosure that differ from United States laws, please be advised that Your continued use of the Services will be governed by United States law
this makes it seem even more likely.