I googled the domain test-app.link and it looks like this might be something that directs users to open a link directly in an app on their phone instead of in their browser.
When I directed my browser to that link, it went to a page with a button that said get the app which sends me to the apple App Store, specifically a link to download the wirex bitcoin wallet. On the page on my browser, there is also a message that says I will see the content after downloading the app.
Edit: I download the wirex app, signed up and was able to obtain the following referral link,
https://links.wirexapp.com/MpmB/4bTIQcutbK?action=affiliate-register&code=NVyN0jdZy0W6YFsE1dCviQBased on the above, I would conclude the link he posted to be a referral link. I would recommend not permanently banning the OP if this is the only instance of referral spam. A warning would probably be most appropriate, but at worst a 3 day ban would be in order (both assuming this is the only instance).
Edit2: I dont particularly like wirex and have removed the app from my phone, however it is not explicitly malicious to the extent you can trust apple and their ability to perform their due diligence
Thanks for your review of the link Quickseller. Although i did not know that such referral links are untolerated here (which im guilty of posting), i have no intention of phishing anyone at some point wirex had that kind of referral link, which no has changed to the format which you posted for me as well.