I think everyone with English as Second Language got used to that difference. Especially in startup world, or country economics billion is an often mentioned quantity of money
I've never seen anything but 10^9 used for billions in the modern era, although it is in some >100 y.o. text books. Have you seen 10^12 in the wild lately?
Everywhere in Europe. Every European language other than English (that I know of) uses "billions" for 10^12 and something like "milliards" or "thousands of millions" for 10^9.