It would take something monumental to happen with users signature spamming or alike for 1xbit1.com signatures to be banned from this forum but their account would most probably be not.
This reminds me of Yobit who got screwed in a similar manner sometime back. Their campaign participants were encouraged to spam like crazy which led to the moderators taking action unexpectedly.
On the other hand, 1xbit doesn't encourage spamming and enforces the usual rules followed by other signature campaigns in this forum which is why they haven't been banned yet.
Some of their shills like @Erdogan got banned probably because of his own stupidity(Copy-Paste or Spamming etc).