I just checked my app... I have notifications completely enabled in Android. I've never seen such a notification though?
Do you have a screenshot or link to it? I'm just curious to see it at this point.
"Reminder to rate watched items" is even selected in my setting > notifications apparently... Didn't even know this was a thing. now that I know that such an option is there, I'm totally going to uncheck it anyway... but I've still never seen one personally and it sucks that it's not opt-in rather than opt-out.