It’s not.
Linking to external sites via advertising redirects is not allowed.
No unsolicited advertisements of products or commercial services via the site in any way, including (but not limited to) group pages, title pages, user pages, comments, posts or private messages.
A group that has opted out of using MangaDex to distribute their content must opt out in its entirety, including (but not limited to) linking to their website in comments and using any of our channels for recruitment.