Some integrations like @itchio hardcode URLs (So mainly mastodon only) but for theses that call the webfinger endpoint to get the URL they actually support more than even the fediverse as they don't care about the AP endpoint, only the profile-page one and could be used with any website that wants to implement webfinger.
But if your UI is "webfinger acct:" nobody will know what it is :blobfoxlaugh:
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