4. No referral code (ref link) spam.
If i introduce an english service by translating in my language, and if i give my ref link, is it a spam?
IMHO it will be spam.
2. No off -topic posts.
Some posts may not be related with the OP but it may be related the post which in the thread. Is it off topic?
It won't be deleted if the post contributes to that thread. If the post in that thread which you replied to is deleted, then your post will be off-topic and will be deleted too.