The notification preference setting has changed and the email notification for comments/ratings is set back to Off. One would need to enable it to resume getting email notifications for them.
Mine are also all set as disabled.
I do not know the motives behind the apparent change, but, it could be to comply with the laws in many countries.
Most countries have laws expressly forbidding any communication with prior opt-in consent. I am aware the US is an obvious exception to that with the CAN-SPAM laws.
I remember them communicating a change to the preferences a while ago to inform people of changes.
If there was a change notification, I must have missed it.
Setting it back to Off is the right thing to do. Even if users have enabled notifications before the latest change, BL cannot assume users want the new notification options.
I hope this latest change is responding to the problem of designers not getting some comments on their models from users, as described in the following thread.