On Reddit at least, posting links to your own site or your own content on third party sites tends to be seen as "self promotion" and at least a little bit icky,

On Reddit at least, posting links to your own site or your own content on third party sites tends to be seen as "self promotion" and at least a little bit icky, even if you don't financially benefit. Some subreddit communities will tolerate it if you are an active participant in other threads on the sub; others dislike it even then.