Does this means we are allowed to post Ref links as long as we don't spam it?
No, share your referral link on your post/thread absolutely is not allowed.
It is
allowed if it's not a spam like the rule said,
one example is freebitco.in's
thread which has wetsuit's referral code "
?r=4" in Huge text-link which has been posted there and still active for 6 years.
Why? It's a legitimate post that "
advertise" the site, not off-topic and
the main purpose isn't the referral code. (
only one post per site is allowed in gambling board)
If it is a one-line or long spammy thread with a sole purpose of displaying the referral code, it will be deleted (
mods and patrollers can easily spot obvious spam).
Some DTs will Tag you for displaying referral link(s).
And worse, if there's too many referral-link posts and threads, you'll get banned by a mod.
Tip: just use your signature space for those purposes as long as the site isn't a scam (
that's an issue too).