It's well known that big tech companies are overstaffed. You probably can't build Dropbox in a weekend starting from scratch, but a smaller scale cloud-based storage solution can be deployed very quickly if you start from existing open source components. And a small team of experienced web devs can certainly build a cloud storage thing in a matter of weeks from scratch too.

> It's well known that big tech companies are overstaffed.

To who? What evidence is there either way?

Is it an often-repeated story online? That sort of information is both well known and unreliable - it's well-known misinformation.