We used .dev before google registered it so we migrated to another paid domain so we don't need to pay huge amount per year to google
>Register a TLD which is informal standard for development websites and environments (.dev)
>Charge an excessive amount of money for it
>To make sure you ruin everyone's day, put it on a HSTS preload list
>Refuse to elaborate
You cant make it up.
The first point is valid but that is mostly ICANN's fault, they should have proposed it as reserved instead of selling it.
FAFO, as they say.