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The vast majority of WSB members weren't on the subreddit two weeks ago. At this point it may as well be a completely different community.

It was also a completely different community at 50k vs. 500k etc. At that point it started hitting /r/all consistently.

/r/all does immediately ruin the subreddits that appear there.

To put this in context, the member count went from (at most) 1.5M to 8.5M within weeks. No wonder it got crazy out there.