After you are blacklisted, can't you still get security updates from other grsecurity subscribers? I suppose grsecurity could also blacklist any subscribers sharing to blacklisted people, but how could they possibly enforce this, if your friendly subscriber doesn't tell?
According to the Reddit thread linked in this thread, no one has ever been blacklisted:
> We have in fact never had to terminate a relationship with any customer of ours. We build trusted relationships with our customers, so any talk of "threats" or anything else is simply completely fabricated (as you obviously noted, anyone repeating such claims has no evidence whatsoever for them).