All human, made by a community of volunteers. There are currently about 200 cheat sheets: https://duck.co/ia?q=cheat

(Disclaimer: DuckDuckGo staff)

Instant answers are open sourced. :)

I'm not affiliated with DuckDuckGo, but I did develop a couple of them, like WordPress cheat sheet[0] and nmap cheat sheet[1]

[0] https://duckduckgo.com/?q=wordpress+cheat+sheet&t=canonical&...

[1] https://duckduckgo.com/?q=nmap+cheat+sheet&t=canonical&ia=ch...

When an instant answer is developed by some member of the community, you'll notice a small (i) icon on the right side of the instant answer. Once you click on it, you'll see the details about who developed it.