I can say (in our latitudes) that a link to other websites etc. requires the consent of both parties (hosting), both from the owner of the page and where the link should lead.
Well, indeed it depends in the country, but even so, they can at maximum ask the removal for Patreon, not for Discord (unless Patreon bought Discord, though it would be a contradiction, Discord is often used to share files and patches that Patreon does not like), and if that was they case, they should ask to remove all the Patreon links from F95, otherwise, it means they are actually going to find on the Internet other sites where Zorlun his, and then targeting him - as I wrote, that count as online stalking in some countries.
And notice they can ask to remove the link, but if I type the URL ("address") as
You must be registered to see the links
, that is not a link, though unfortunately the form is configured to automatically convert URLs to link, that is something the mods may want to change, and let people decide whether to put them as links or not, to avoid this type of problems