There's a rule to not add referral code or referral link as it's considered referral spam. I want to know that does that rule apply to everyone? Also, I want to know that is it okay to post referral code on some occasions or in some threads where there's possibility?
I've noticed that in various signature campaigns and some other threads where OP's sometimes post referral link of the platform that they're promoting with a message that if you've not joined the platform yet then you may join it by clicking this link, something similar.
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Note that rules are rules, there shouldn't be an exception for anyone. Anyone caught violating it should be warned/corrected, or punished.
However, the difference in what you pointed out could be linked to many people doing this unnoticed, or unreported, which makes them go scot-free. Again, some might be punished, but you might not know about it.
To avoid issues altogether, I think you should follow the rule as guided by the forum rules.