A very basic theme component (courtesy of 
) using a hardcoded domain list:
<script type="text/discourse-plugin" version="0.8.25">
api.decorateCookedElement((element) => {
const domainsToUnlink = ["example.com", "specificdomain.com"];
const links = element.querySelectorAll("a");
links.forEach((link) => {
const url = new URL(link.href);
if (domainsToUnlink.includes(url.hostname)) {
const textNode = document.createTextNode(link.textContent);
link.replaceWith(textNode);
}
});
}, { id: "unlink-specific-domains" });
</script>
