But there aren't 3 different Amazon marketplaces--owned by Amazon--built on that infra. And AWS is available standalone. Here we have core infrastructure that

But there aren't 3 different Amazon marketplaces--owned by Amazon--built on that infra. And AWS is available standalone. Here we have core infrastructure that isn't sold to anyone else and powering 3 supposedly different social messaging services. The key isn't the backend, it's the supposed independence of the frontends.