Except if you happen to travel for more than 45 days, in which case Google Fi will promptly tell you to get fucked and cut off your service without warning, advanced notice, or spelling out anywhere when you sign up. Not my idea of a carrier I can trust. I deleted my account and service with them to move to a carrier that I can trust and actually respects me as a customer.
tbf, that was because a lot of people abused it by being permanently outside of the US and relying exclusively on the roaming for all their data. I know because I was one of those people for 6 years.
I've switched to US Mobile. I haven't used it on an extended basis internationally yet, but I am about to travel internationally, so will find out soon. That said, the reviews are pretty good by people that use it internationally for an extended period of time.