The service is not meant to cater to the lowest common denominator. If you unsubscribe from critical notifications and get screwed over.. that is on you.
It is not fair to the rest of us to be inundated with endless spam just so some screwup can be kept from doing something stupid.
Transactional email from a backup service you deliberately signed up to isn’t spam, so congratulations you’ve got what you’re after.
Now someone will likely reply shifting the definition of what “spam” is to include Rsync’s critical service emails, and now the term spam is so wide as to be meaningless.
At that point it’s on you to manage your own spam filter if you truly feel “your critical backup service is down” is spam. I haven’t been inundated with endless spam for about a decade.
Abusix don’t know what they are talking about, and basically all services that let you manage your email notifications still send through critical “your service is about to be turned off because your card details failed” emails regardless of how many checkboxes you disable — and for good reason.
I got dogpiled on here a couple weeks ago for the temerity to suggest that "spam" is, by definition, unsolicited. Unreasonable people like this put companies in no-win situations.
It is not fair to the rest of us to be inundated with endless spam just so some screwup can be kept from doing something stupid.