Durable Objects is a low-level primitive which you can certainly build all sorts of distributed systems on -- including ones that compete with our own products. In fact, those products of ours are often themselves built on Durable Objects!

Personally, I would be absolutely thrilled to see people building their own custom versions of these products directly on DO, and I think the rest of the team would agree. Our goal is to productize our physical network (machines in hundreds of locations worldwide). We build high-level products to make it easier for people to use us, but if you want to build your own versions of those products based on our lower-level primitives, that's great!

(I'm the lead engineer on Workers.)

(I don't know the story with that other customer from earlier today, so cannot comment there, sorry.)