You might be an up and coming artist who would like to introduce yourself and your email address is too long to be memorable.
Maybe you’re in a business with a massively long domain name,
get email@example.com for a measly $5 per year, why not get 2!
It then gets securely redirected to your gmail (or any) account.
We have a few people that have a family email address that automatically sends to every family member like firstname.lastname@example.org