> The biggest impact I can see, other than the headache of migration, is that former GFYD email address can NEVER be used for docs, drive etc, even on the same terms as a free personal account.

Uh oh. So, let's say I take my custom domain email address and set it up on a non-Google provider. (The whole reason I have a custom domain is to avoid locking me to a vendor).

I can't then set up an ordinary personal google account using this email, it'll be reserved forever?

That stinks.