- Why would you expect them to have more than the bootcamp on their resume? Most people don't have prior programming experience, and most bootcamps are demanding, such that they wouldn't have time for side projects.

- Is the test using a language they're familiar with? An editor they're familiar with? Is it pair programming, or are they just given a computer and a desk? Are they allowed to use Google/SO/etc?

- Why do you expect them to have a curated and up-to-date GitHub? Most of the code on there will only be stuff related to their bootcamp program.

Without knowing the specifics of your interview or the particular bootcamps you're hiring from, it sounds like your expectations are mismatched with what the bootcamps are teaching.