Solve a bunch of math problems really fast? They don't have to be complex, as long as they're completed far quicker than a person typing could manage.

you'd also have to check if it's a human using an AI to impersonate another AI

We try to do the same for a human using another human by making the time limits shorter.

> There are some important million-person apps, but most of them just destroy civil society, melt our brains, and arrange chauffeurs for individual cheeseburgers.

All the cool technical stuff aside - this, for me, was the standout line of the article

> Two things, however, were consistently true throughout our usage. First, our Datadog bills were steep, roughly 2-3x of what we would otherwise expect to pay for equivalent telemetry storage and retention. Second, despite the richness of the platform, we rarely used Datadog for anything beyond being a reliable system of record for logs, metrics, and traces. We were paying for workflows we almost never touched.

This paragraph from the article makes it clear otherwise.