I just ran a backup, and it was 850MB. So having my phone upload something of that size every day would be a bit annoying.
Most of the major cloud storage platforms don't offer sync on Android.
It's not really a good fit for how the filesystem is used by Android apps.
I currently only do a Signal backup every few months (when I remember), and manually upload it to OneDrive.
I'm not going to pay for their new service - I already pay for too many storage services.