I had a lengthy chat with a Fi rep last week. I'm not thrilled.
The gist is that they are NOT going to offer Nexus Protect through Fi. Instead, they are going to offer something "better" that is exclusive to Fi but they couldn't tell me what or when that would be. I told them that one of the reasons I elected to try Fi was that there would be no difference if I ultimately decided to cancel due to mediocre coverage in my area--with this news, it appears that if I cancel Fi I will not have the opportunity to purchase Nexus Protect and I would lose any Fi protection plan.
But in surprising news: I also complained that we shouldn't have to wait considering Nexus Protect is already available for non-Fi purchasers--told the Fi rep that I have two small children and wanted to protect my phone from their whims while they're still figuring things out on Fi's end. The Fi rep surprised me by saying that Fi customers can replace damaged phones for a $100 fee. She said it was part of our warranty, but I don't see anything from Fi documenting that feature.
Bottom line is that I'm not thrilled with Fi. They mean well, but their execution from a logistics standpoint has been mediocre at best. It's classic Google of opening something to the general public when it's still not ready for primetime.
So yeah, I'm canceling Fi, RMA-ing my phone, getting a new 5X so I can buy Nexus Protect coverage (and also not have a non-uninstallable Fi app on my phone), then reactivating my number on Cricket Wireless.