Not surprised but there's a silver lining
I'd had enough & left them before they announced this migration. Frankly, I'm not surprised. But at least it's stopped them spamming me about renewing a domain they no longer manage.
One worrying aspect about their service turned up during my migration. I'd allowed as testing domain to lapse & set it up elsewhere. That was the first to be transferred to my new provider. Attempts to send email to it from the domain they still hosted were bounced by them and raising tickets had no effect. Emailing from anywhere else still worked. Clearly having once had the domain they seem disinclined to accept anybody else can host it. It seems to be of a piece with their spamming. The worrying aspect was that if this was SOP for them any current customer wouldn't be able to email any ex-customer. Possibly, just possibly, they'll have failed to migrate all this old baggage.