The best test is going to be using it. There are too many factors to have a good predictive test.
Can't directly refute this, but wouldn't you think GCP is peered with the vast majority of local ISPs (in America and maybe the EU)?
From a network administrator's point of view, they're an absolute joy to work with too.
If you're share any IXes with them at all, they'll peer with you. Private / appliance based peering has additional requirements, but that's par for course.
Most of the pushback is on the ISP end.
The internet upgrade in Australia (NBN) is well known as the biggest government fuck up in the last 20 years.
All to upgrade them from 13Mbps to 17Mbps. Yes, I'm being serious.
For anyone who thinks this is hyperbole, I assure you it's not, my internet quite literally grinds to a halt when it rains too much.
I'm also disappointed by the dramatic extension of the "you don't own the games you buy", since there's not even an option to download the titles and play offline. It gets more worrisome based on Google's demonstrated "go to HN" form of customer support.