I would expect them to be getting more value from the $20/month VPS, otherwise they could go with a $5/month plan (half of Dropbox’s cheapest plan).

Myself, I resolved the 3-client limit (which they hit me with when switching to a new phone — trying to use backups stored in Dropbox) by a swift migration to OneDrive (where I have 40 GB of free space due to various offers and grandfathering, that’s plenty enough for me). The Linux situation isn’t ideal (there’s a reasonable CLI-only not-real-time client), but otherwise, it’s great. And if I did decide to pay, there’s a neat and cheap 100 GB plan for 2€/month, or a 69€/year plan with 1 TB and desktop Microsoft Office — a bargain compared to Dropbox’s 2-TB-and-not-much-else for €120/year plan. The only thing Dropbox has these days is name recognition and intertia, everyone else’s offerings are cheaper and have more features.