But aliases can be easily mapped back to your normal email address, unlike Apple's which are opaque. I, too, am afraid of vendor lock-in though. Sadly, couldn't find a good alternative yet
There's no solution to lock-in because there must be some massively shared domain that the email address exists on for the anonymity of the service to properly work. However if you are simply looking for an alternative to Apple, Fastmail offers a masked email service too.
Not sure where you're coming from - my original email address is not being shown in headers, so those seem fairly opaque. Probably depends on your email provider?
