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Is there any risk of a subreddit getting banned by the spam filter because all posts link to a single domain?

I don't think so. There are subreddit (ab)used for even sillier thing than that: see RedditStorage[1] for example.

Nope, you are free to do whatever with your own subreddit, e.g.:

It's actually still against the rules

> Even in your own subreddit, just submitting links to your own site/stuff can get you banned [0]

It's what leads to people getting shadow banned and not understanding why