Shadowbans are sitewide and almost always automates actions to counter spam.

Your chances are better if you avoid doing “spam-like” things:

• Using URL shorteners
• Posting links to several subreddits at once
• Using a lot of links in your comments
• All of the above on a fresh account
• etc.

If you are unlucky and caught in a false positive, there is an /appeals form that is usually helpful.