As reported in https://community.metabrainz.org/t/broken-url-normalization-for-patreon/813827 it seems Patreon now has some links that include /cw on the URL, such as https://www.patreon.com/cw/BereniceElenion - not sure what it means.

We should be able to just clean them to remove /cw since they redirect fine, at least at the moment.