By "cloud computing expert", do you mean Amazon sales shill? It's weird enough that someone on HN would just use that vague credential of "expert" in the first place, but this thread is ridiculous ('round here, usually we recognize experts when they say something along the lines of "Hi, I'm the guy discussed in the article...", or "Hi, I actually wrote that software 15 years ago...").
You know that Snap can hire more than 3 people, right? They can have people working on the infrastructure at the same time that someone else works on "the product" they want to build. That's what happened at Google, and as a side effect, they now have a cloud platform they can rent out.
There are some benefits to using cloud services in some cases. It's rare that 100% cloud is a wise deployment move, especially for companies that operate at Snap-scale.