With So Many Breaches, Apple's Hide My Email Is More Necessary Than Ever
It can't protect you completely, but it can limit the damage from a data breach.

I seem to get emails almost every week informing me that one of my online accounts has been part of a data breach and that personal information such as my email address and other contact information has been leaked. One breach was so severe that the company involved gave me a year's free access to a credit and identity monitoring service.