Can you comment on a reply below that claims there was promotional pricing in 2019 at launch?
Regardless, forum.dev was registered in 2021 (you can confirm via WHOIS), which was long after the Early Access Program for .dev ended in 2019.
https://news.ycombinator.com/item?id=33929354
Do you have proof of the initial price paid for registration or is this in some part speculation?