From https://podcasters.apple.com/support/852-ratings-and-reviews :
'Reviews are associated with a listener’s Apple ID and are specific to a country or region. For example, if a listener rates or posts a review with a Canadian Apple ID, that review or rating is only visible to other users in Canada. Listeners can see all of their ratings and reviews by tapping on their profile photo at the top of Listen Now, then Ratings and Reviews. They can swipe to remove a rating or review.
'As a podcaster, you can read your ratings and reviews from all countries in Apple Podcasts Connect. You can also download reviews in an easy to use CSV file.'