Updated, but...while I'm kind of annoyed by Twitter's sporadic paywalls and I can at least understand where you're coming from, this isn't in the instance rules that I can see; I had to go searching for the poll to find it. I use communities on a ton of instances; I guarantee that I'm never gonna remember which specific instance doesn't do links to a specific domain.

Have you guys considered running some kind of an x.com-to-archive.is link-posting bot or something like that? That way, users don't need to remember policy like that. We had a bunch of subreddits back on Reddit that ran bots for things like AMP links.