We're starting to see similar technologies emerge (like Fastly's Lucet). My hypotheses (please take them as that): 1. Many companies are already deeply embedded and invested in container based offerings. 2. As with every new technology, it takes some time for it to take off. Maybe others are hesitant and waiting to see how it plays out for Workers before investing (going pretty well so far :) ). 3. Possible the other providers are working on it, and haven't launched yet.