content: Office 365 is also used by a lot of small and medium size businesses. And there are a lot of businesses where 1 TB is not a lot of data. Imagine a wedding photographer who uses the lossless RAW format. One photo can be 50MB. If they take 200 photos per wedding that's 10GB per wedding. If they do 2 weddings a week that's over a 1TB per year.  I have friend who runs a small animation business, working on cgi and animation for TV adverts. The raw files they work with are well over 100GB each. Likewise I have another acquaintance who's a graphic designer that designs posters and billboards and many other forms of print. The files may only be 50MB to 200MB. But the source files can be up to 1GB. And their company may do 5-10 jobs a day.  The last place I worked, we would do a snapshot of all the financial records and important data in shared folders on the local network at the end of every workday and back it up off site using cloud storage. (In case of fire or burglary) That was 600MB a day. We also had the last 14 years client data backed up off site, but we had to use a 4TB hard drive for that. If you tell people they have unlimited storage, and that they can back up all their work at an off site location, they'll find a way to use it.