Yeah but using your argument that iCloud isn't a backup, then Backblaze in this situation really isn't either
These $1000-$1500 Macs are for the average Joe/Jane. They likely don't have a regular backup plan (much less off-site). I've set dozens of friends/family members with a 200GB/2TB iCloud plan, and they all seem satisfied. Can't recall any time that anyone lost data or got in a bind.
Keep in mind, iCloud has ~4-6 redundant geo-backups for your data. Actually losing it due to Apple's fault is nearly impossible.