The poll is far older. It happened around 2007-2008. That was the first cub porn ban, which caused a shitstorm. There were some artists who "left" (to DeviantArt or VCL, there were no other alternatives at the time) when cub porn ended up being unbanned. The recent ban happened around 2011 and was preceded by InkBunny's creation by a few months. However, since the timing was so succinct, InkBunny ended up becoming pedohaven in everyone's eyes and that's why it can't compete with FurAffinity.
You're correct on the poll. The second decision was because FA couldn't beg anymore - no payment processor would take them. The rumor, additionally, was that Sciggles pressured Piche, because she was quite rightly 'not into it'. He, of course, always has been.
I take issue with the innocent explanation for Inkbunny, though. While they gladly take non-pedo furry art, both in staffing (Greenreaper would be enough all by himself) and in policy (cub? good! Humans, bad, because the intersection of the two can get us in trouble) was pretty clearly 'for us, by us' for the furry pedo set. Inkbunny was clearly in the works beforehand as one of the periodic attempts to 'replace FA', and I think if anything on the timing, it was moved up by FA's decision.
Regardless, it's now self-fulfilling: IB is 'where you go to post cub' so only people who want that go there. And when that's all that gets posted... It effectively becomes that. The site had some really innovative features - subscriptions, paywalling, a proper API, a non-stone age site design, but it has the stigma, and it's mostly warranted.