I think a lot of people have been blacklisted for unknown reason in last round of airdrop, I guess the most possible reason is that they posted in a local board of BCT with a local language, and most of the post in local language will be considered as low quality post by dev.

Like me, I just post there in China board in Chinese, I really follow the rules strictly to post and really give the positive post for Onion but I still blacklisted for the reason that low quality post .
Maybe the best way to avoid to be blacklisted by mistake is to post in the main board of BCT and use English.

Come on guys, don't be sad if you've been blacklisted by mistake, just don't give up and keep supporting onion in BCT, try your best to be reconsidered for the great airdrop of onion.