Very cool! Could you go deeper into your setup?
Which email client do you use to view/manage the catch all emails?
Did you host the email on Google Gsuite or AWS SES or something else?
Edit: Apparently you can also purchase a domain directly through them if you prefer, although you have to be a paying customer for 7 days first https://www.fastmail.com/how-to/email-for-your-domain/