Backblaze and Crashplan aren't really comparable to iCloud, in the same way that they shouldn't be compared to Dropbox. They're both backup services, neither position themselves as online file storage in quite the same way.
iCloud storage includes file storage, iOS backups, mail (if you're using an iCloud email address), and photos. It doesn't have the same features as Dropbox or Box, but I prefer it simply because it works fine for me. I'm on a 200GB plan and plan to upgrade once the family sharing plans are live.
Personally, $120/year for 2TB of online storage for a service I regularly use is actually great. But I'm still disappointed that iCloud only comes with 5GB of free storage and the pricing options of lower tiers hasn't really changed.