alt Hacker News> Cloudflare, for example, removed the ability to change the nameservers for all domains registered with them.
Cloudflare never offered that ability. From the time they started offering domain registrations, it was always with the caveat that the nameservers would be fixed to Cloudflare's.
Correct, I guess I should have clarified that I mean they removed the ability that most registrars have, in an attempt to make domains into a revenue driver for their primary product.