I've run into one government website that required email addresses to come from gmail.com, outlook.com, or another common domain, and several websites that won't let you change your email address once registered. It also makes it really confusing if someone needs to share Google Docs with you. So I've moved as much as I can off of Google, but some stuff will linger forever.
I've run into this, too, and found it hilarious because I remember when some sites wouldn't allow you to sign up with hotmail, gmail or other free email provider (over 20 years ago).
