Eh, I wouldn’t be so harsh. Tens of millions means that hundreds of millions aren’t in gaming clans, and I’ll bet most don’t know that it’s a term of art. Putting in quotes seems justified for the likely audience. You wouldn’t use the quotes if it were an article on, say, Boing Boing or Kotaku.
Besides, that was at the end of the article. So if that’s where you lost it, well, you held on pretty well! 
