Earlier quoted context omitted.
90% of everybody's incoming calls are spam bots.
I've never been robocalled, but I've had "microsoft support" scammers call me once. I'm in Sweden. Not sure if the difference between 90% and 0% is technological or legislative.
On the other hand, there are countries which are poor, not the US, and have lots of English speakers, and these scams tend to be run from those countries, at least according to the callers' accents.