Ko-fi has a "shop" feature that allows users to sell products. Product URLs have the form https://ko-fi.com/s/xxxxxxxxxx where xxxxxxxxxx is an alphanumeric ID. However, the Ko-fi URL support added in MBS-9748 cleans up such a URL to https://ko-fi.com/s because (I assume) it was only intended for user profiles.

I was trying to add such a product URL to a release as part of a "purchase for mail-order" relationship but it was cleaned up incorrectly. I assume this is a valid use case for such a URL.