Actually most of the airdrops I've seen do not require you to post "I join". Some of them ask you to write something in their thread, but you can write something else like "this project looks very interesting", etc. And the ban is real, because many people unnecessarily write such posts, when the same forum rules prohibit advertisers from requesting that requirement.

is there an airdrop without post "join" in bitcointalk? I heard there is a new rule of bitcointalk, account will banned if post "join"

To my shock and horror I found out today, after applying to MANY airdrops that I did not even had an username set-up in Telegram. Apparently if you go to Settings you have an option called "username" that by default is empty. So ...I think I lost the last two weeks for nothing. So many opportunities...and I cannot apply again to correct the mistake because they will ban me for double applying...

DeepOnion airdrop is comming. It is 16th Airdrop. Total 40 airdrop planned by deeponion. The new thing is that members registered on bitcointalk before october1, 2017 may participate. You must wear DeepOnion Signature during the course of all airdrop.