I'd really like to use this on my computer. The article says it uses the WireGuard protocol, can I just take the private key from my device, put it in a configuration file and use it?
If you can extract the endpoints, private and public keys, it might work. It would be considered unsupported and might be considered a violation of the terms of use. Check the license agreement.
That answer is correct, but official word is here https://news.ycombinator.com/item?id=21071258
(Not my Twitter account, just saw it on my timeline)