Because you’ve got to get your email over someone’s pipes eventually.
Fastmail is excellent. If you want secure/private/not easily spoofable by a 5 year old and you’re using email.... then you’re doing it all wrong.
Certainly not.
My comment is relating to their data encryption laws that was passed in 2018. If you care about your privacy in any way, shape or form, individuals should be very wary of using services that operate from, or are owned by individuals in Australia (and the rest of the 5 eyes for that matter) unless you have your encryption keys and all encryption happens on your client app.