system
Given the following post, respond as if you're commenting on Reddit:
human
[Fallout] Were there any significant shelter builders other than Vault-Tec?

It appears that every vault one finds in 2281 was constructed by Vault-Tec. This seems strange, since the threat of the Great War had probably been hanging over the heads of Americans for many decades. 

It's likely lots of companies, local governments, and even well-off families would have commissioned survival shelters. But they don't appear to be in the wasteland, and everything looks to be built by Vault-Tec.

Are there any small shelters, and why does does it looks like everything was built by Vault-Tec?
gpt
Maybe the other vault-building companies were not complete monsters and built vaults that actually worked and that actually were designed to safeguard their inhabitants, and that's why there's noboy coming out of them ;)

Also, what about Europe, India, Russia and China? But that's a question not just for the vault-building topic…