"AI labs"
Can we stop this misleading language. They're doing product development. It's not a "laboratory" doing scientific research. There's no attempt at the scientific method. It's a software firm and these are software developers/project managers.
Which brings me to point 2. These guys are selling AI tooling. Obviously there's a huge desire to dogfood the tooling. Plus, by joining the company, you are buying into the hype and the vision. It would be more surprising if they weren't using their own tools the whole time. If you can't even sell to yourself...