Advertising a service that a supplier has no intention of providing is called fraud.
Similarly some software I wrote a couple years ago, that wrote a bunch of small files into a single S3 bucket caused a lot of grief at a 3rd party S3 like service because they never imagined someone would write a couple TB of data into a single bucket (actually it used multiple buckets but each one was a TB or two of <1k files).
CrashPlan lost some of my data some time in 2012/13, blaming it on how they work with Windows's Volume Shadow Copy Service (VSS).
I should have stopped my subscription there and then, but I continued subscribing for another 2 years, probably because I was anxious about needing something else that was in the file retention history.
It wasn't a very good service anyway — slow to upload, often stopping mysteriously, and requiring 1GB of RAM for every 1TB backed up.
https://support.code42.com/CrashPlan/4/Configuring/Unsupport...
That means I've probably got a bit of duplication @ crashplan, but given the bulk of the data is a .jpg/mpeg dump from my cameras I don't care about the 5-10% of the archive which isn't compressed and likely has some duplication (the .git repos).
OTOH, crashplan isn't my only backup plan, so if they explode tomorrow I don't think it will cause me any grief outside of having to find another offsite/cloud backup solution.
(also as a further note, looking at my config log, it seems I need /proc/sys/fs/inotify/max_user_watches bumped pretty hard just to keep it running).