o the only vote that account did was for Steemvoter because it doesn't have enough SP to qualify for rules.
So this account was not using your service, so you didn't care to actually notify this user in a proper way, because you could still use his key.
you may not have noticed the company communication on our blogs nor logged into the site to see the changes
Any change of Terms of Service should require acceptance from user. This is perfect reason to downvote all your posts until you will not notify and get acceptance of all users from whom you are using the keys