Not only that, but they had dedicated hardware for it since smartphones weren't ubiquitous yet. I still remember the first time I saw a friend use one, and how

Not only that, but they had dedicated hardware for it since smartphones weren't ubiquitous yet. I still remember the first time I saw a friend use one, and how mystified I was by this mysterious "authenticator". It's still absolutely wild to me to think about how ahead of the game Blizzard was on the 2FA front. They only recently replaced their dedicated smartphone app for 2FA by rolling it into the existing Battle.net app. The 2FA codes they use are longer than 6 digits, which I assume is why they don't support something that can be used by more "mainstream" 2FA apps; by the time those become established enough to support third parties, I suspect their infrastructure had been around long enough that it just wouldn't be worth rewriting it. I do sometimes wonder if someday apps like Google Authenticator will support a wider variety of TOTP configurations; I think Steam also uses something non-standard, which means the only mobile option is a dedicated app, and I'd much rather not have to install extra apps just for 2FA support.