Be careful peeps. Nintendo can't ban EVERYONE, IN ONE GO, meeting a simplistic criteria like "has custom firmware or hombrew activity in a log" - they will have at least, say (for argument's sake) 1% "bad calls" - young siblings whose older brother/sister experimented incompetently with their console, people who have bought second hand systems or received them as gift that have hidden traces of such activity, or people who spend lots legitimately on their system and just wanted to try out some cool, but legal hombrew etc If they banned 1 million people in one go this would result in ~10,000 complaints in a very short time, impacting customer service and generating bad publicity all over the media (It only takes one disadvantaged child impacted by an unfair ban to hit the media to cost Nintendo millions)
This was probably a "test the water" exercise, if it seems to have been mostly successful, with minor true casualties, then expect more hits soon. I suggest a lot of people, LIKE ME, raise their concerns on the forums that people will be hit unfairly. I have spent well over a thousand pounds on Nintendo Consoles and legit Cartridges and have considered CFW to test out titles for our kids when no free demo is available, since we are wasting money on cartridges that they stopped playing after a few days.