Low code tool plus hosting platform, and also the final form of Fog Creek which you may have heard about from Joel on Software blog posts if you read tech blogs 15 years ago
It was a low-code "make your own website" platform. The sort of thing that was popular before myspace/facebook/medium style walled gardens took over.
Fastly bought it because they were/are desperate to pivot away from CDN, since CDN has negative margins.
How many cuils are we talking about?
I would like to report an instance of heavy Baader-Meinhof as just yesterday I randomly wondered how many cuils are actually genuinely achievable in simple text and it's two at most IMO.