Here you go!
https://we.design/?coupon=HUI
Originally for CodePen users.
You can register your free .design and some other extensions for a year with free privacy settings and email.
I just did it.
Which is why
Pinegrow.design Isnt available 
The Registra is a relatively new one (3rd Generation) - PorkBun
-Maybe not the best name for a company to deal with followers of Islam…
I notice you get one free account with each bank card you register. That is, I registered for an account. used a bank card, got my free domain (Yay!) but wanted another too. set up a new account used the same card, and it said Sorry, this card is already registered to a different account and wouldnt let me use it.
SO, I had to use another!
Oh and if your just using this to learn and fool around, remember to
TURN OFF AUTO PAYMENT RENEWAL
Or, you will be paying $35 in a years time.