Bans for having multiple registrations is pretty standard. Some sites are so militant about this, that the only thing they check is the IP -- meaning two people in the same household can't even have accounts on the same site.
My 128GB 6 Plus did act erratically when I first got it. Rather than taking it to Apple, or complaining on a forum, I decided to do some basic troubleshooting. When I bought it, I set it up over the air from an iCloud backup, so the first thing I checked was to see if the problems stemmed from that. I erased the phone and set it up as a new device while physically plugged in to my iTunes library on my Mac. That went without a hitch, and I haven't had any problems since.
2 million is the "platinum" number, but my understanding is it only applies to sales. At least from what I've read in the past, albums that are given away are not eligible for those certifications.
The number though, is the ones who got it through the iTunes store. That would be the people who don't own iOS devices, and had to specifically seek it out, wouldn't it?