Second is that it's hosted. That makes it a non-starter for enterprise reporting.
>Data Studio is currently available to users in the United States and we’ll be rolling it out to other geographic regions throughout the year. We hope it helps you share more data and make better business decisions.
Interesting point: what if you work for someone in the US and want to collaborate on a report?
Or you work in the US but need to access / change a report while visiting a client in a country where it's not enabled...
Pretty lame.
So the easy thing is to limit it to the US.
I am abbreviating massively here, but since the "Safe Harbor" things are actually a little bit more rough around data transfers.
Non the less Data Studio is available in Germany, as I have already used it. I might be limited on the data sources though.