except atm, Nintendo appear pretty lax with gateway existing.......its in gateways interest too to notI highly doubt a company that provides a device used primarily in piracy is going to care much about "ruining online gameplay". Datel a somewhat more legitimate company would worry about this, but not Gateway.
A) piss nintendo off any further than just letting people pirate
and
B) not piss off the wider 3DS consumer base, which would no doubt lead to much more action from nintnedo as now legitimate customers are being affected, right now, letting gateway users play online, pretty much just effects things in a positive way, i.e more players online = more people to play with.....if these people become a problem, well then they will have to act upon it
does everyone fancy being blocked from online so some 10 year old can think he is l33t haxor for a few weeks?