[jeffbee]

> when my drive or backups are almost out of space, which makes sense.

This only makes sense to iCloud users. I've never intentionally put anything in iCloud and I get a constant parade of alerts about it being full. On macOS it doesn't matter where you click on the alert widget, it takes you to the page where you can pay for iCloud regardless. It is very spammy.

[crazygringo]

Yes, phone backups are automatically (or opt-in?) made to iCloud's free storage tier. This is a feature, not a bug, since phones are easily lost/stolen and your average consumer will be happy they didn't lose all their photos and messages. If your free-tier backup space is full, then you need to manage your backups to disable/delete them or reduce your backup size -- those alerts are there for a good reason.

Also, the Mac notification has a prominent "Close" button and doesn't even mention iCloud until you click through to see available options:

https://nektony.com/mac-startup-disk-full

https://macpaw.com/how-to/startup-disk-full-on-mac-os-x