First I went to the Claude web site, because we've all been trained not to click on links promising things, right? Couldn't find anything there so I checked the domain carefully and clicked on the link, which takes me to my settings page with no discernible discount. I am no longer surprised by anything not working, perhaps Claude itself vibe-sent this mass email.

That makes a lot more sense than banning them outright - this way, customers have one place to manage their Claude credits instead of having inexplicably separate API and Claude.ai billing. Now I hope they put together an official way to access Claude.ai via OAuth or the like, so third-party software has a easy way to integrate with this extra usage system w/o reverse engineering.