This is odd, because I woke up wondering if the same thing wasn't the case. As one of the non-banned, there has to be a reason i didn't get flagged and banned.
Blizzard GMs are clearly lying when they say they have 'years' of logs on users, because if that was the case I'd have been banned. It must have been something temporary and in a small window time-frame.
This leaves me thinking that they unleashed something of questionable legality in some jurisdictions and simply aren't mentioning it for obvious reasons. Release blizzwarez, collect data, sit on it for a month, then ban. Decreases the chances one of the banned can gather info on what got them banned.
I would be curious to see some polling of non-banned users to get an idea of what they were or weren't doing. Such as not using an administrative account on their OS, not using certain routines/bot bases, not having played during a certain stretch of time. (the last one seems pretty common, from what I recall)