[atrettel]

What services have you not been able to change your email address for?

I have done the exact same process over the last few years --- moving from Gmail to a my own domain --- and I have found only around 10 services that did not let me change my email address. I view that as a success personally.

[pllbnk]

Mostly niche services of local relevance such as local online shops. I could probably email their support and ask to update my email address but often it's not worth the effort because I can still keep my gmail for low importance mail.