I would expect them to grow faster than 1 million users a day in that case, since chatGPT has almost a billion users. Maybe everyone's just using the web app or mobile?

I was using the web app. Don't see any reason to use anything else for basic chat. Not having access to my computer is a feature

As someone who just used computer use to successfully perform a "change of address" across 52 different services, hard disagree. It's magic.