That's indeed how I view this rule as a mod. Self promotion is ok, "excessive" self promotion isn't. I'm aware it is a bit vague, maybe we should explain it better on the sidebar to avoid unnecessary conflict. I'll bring it up on the moderation Discord.

But to make it clearer, my opinion on the matter is that excessive self-promotion amount to the following cases :

• Making multiple post about the same topic, multiples time is a shortish amount of time. Like posting once, then reposting the following day if your topic didn't get as much traction as you'd have wished
• Promoting things for monetary gains (sponsored links, etc.) without first disclosing it. As an example, I removed a service offering a backgammon online platform, by removing their first topic in order to make sure it was legit, which it seems to have been, not a ads/virus ridden website, which it wasn't, and not paid, which it didn't seem to be. As they happened to have made a new post in the meantime, I did not restore the first one, but did not remove the second one.

Of course that's my opinion of the rules, the other mods may have a different opinion on the matter. I try my best to find a balance in my decisions.