Which is why this is likely to end up getting rolled back. Surely most of these providers are dominated by spam. But equally surely all of them carry some legitimate traffic (or else this particular trigger would have been pulled already).
There will be friendly fire from this policy decision, almost certainly.
In the US? Most normie people I know barely even know anyone that's visited overseas anywhere other than Canada and Mexico, much less stay connected to family living abroad. Tons of people don't even regularly talk to people outside of state they live in.
Don't get me wrong it's not entirely uncommon and can be common in immigrant communities but outside of that unless you've got wealthy globe-trotting family you probably don't have anyone to talk to overseas. Its something far from "pretty much everyone".