Not all carriers forbid and disable OEM unlocking. Especially outside US it’s not common.
The phone has a fingerprint such as IMEI, but if the scope here is to de-google your device, so it’s about the software side of it, in which GrapheneOS definitely does a great job.
Not at all, every day that passes without GrapheneOS is a wasted day.
Flash now!
How does the saying go again?
The best time to flash Graphene OS in your Pixel Phone was when you first received it. The second best time is now.
That’s why an RSS reader like Feeder is the best. It’s reliable and you don’t have to worry about clicking on the wrong source. Plus it doubles as a news feed for articles.