Airdrops aren't forbidden at all. It's most likely deleted because people are posting wallet addresses in the thread.
Airdrops could be considered special cases of giveaways.
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Giveaway threads are not allowedSpecifically, you are not allowed to give people any incentive to post insubstantial posts in your threads. You can't offer to pay people who post their addresses, usernames, etc.
You can do giveaways off-site and link to the giveaway page in a thread, but you can't give people any bonus for replying to your thread.
Thus all airdrop threads that ask for posts in the [ANN] topics (should it be addresses, "joined airdrop" or some other crap) will eventually be deleted.
Notably, this doesn't apply to all airdrops (topics like ByteBall or Bitcore exist for a long time and are no problem), but a big part of the recently created eXXX tokens.
So for what reason of posting wallets address on some thread should be deleted?
The sticky in the Announcements (Altcoins) section.
Can you give a link of some mods/admin saying this? Or rules?
https://bitcointalk.org/index.php?topic=434310.msg4769283#msg4769283If this is right, then signature campaign threads should be deleted too?
No, signature campaigns are located in different sections of the forum.
This forum does have local rules that only apply to certain sections. Here you have one of them.
Anyway, I've seen many airdrops thread in the past, none of them were deleted by the mods.
You wouldn't see a thread that's already been deleted, would you?