This is great to read now and reflect on where they eventually went in the next 13 years. The basic questions "why Chef" and "why Virtual Box" and so on with requests to support other hypervisors and provisioning tools. Now Packer and Terraform provision and deploy machines to damn near any platform using damn near any provisioning tool, but neither Mitchell himself nor the HashiCorp team in general had to learn all of those tools and platforms. Instead, they provided orchestration systems that allow for a common configuration language and execution model but delegate the logic of how to use the APIs of specific platforms and provisioners to plugins. Seed the ecosystem with plugins representing the most common platforms and toolchains your company is already familiar with and extend from there to stuff you either figure out later or let the community contribute.
This feels like open source and community creation at its best. It's why GNU/Linux systems did what they did. A bunch of professors and hackers tried to clean-room recreate Unix but never finished the kernel. Meanwhile, some grad student made a kernel but no userspace. Then some entirely different teams put these together along with a package manager, installer, and remote filesystems users could fetch ISOs and packages from, and finally you've got a usable system that didn't require a beast the size of Microsoft to do everything in-house. None of them could have done it alone.
It also makes the events of the past year kind of poignant. I see a lot of commenters talking about HashiCorp needing the license change to capture the value of what they created and not allow other companies to siphon it off. But isn't that the point of civilization? We all stand on the shoulders of giants. We generally don't want the first person to come up with an idea and their direct descendants to be the only people who ever profit off of that idea. That's aristocracy. Mitchell is a billionaire, isn't he? None of Linus Torvalds, Richard Stallman, or Ian Murdoch ever became billionaires, but they weren't exactly starving in the street, either. Exactly how much value does a single person need to capture? It's the community we want to see thrive, isn't it? Not just our single company. Every employee of that company can work elsewhere if they need to and every investor has other investments. They aren't going to starve either if the company someday stops growing.
I get not wanting the Amazons and Googles of the world to take open source inputs and put them into proprietary sinkholes where further innovation gets stuck inside of a single company. But isn't that the point of the GPL? Anything they add they also have to give back. You don't need BUSL for that.