There should really be a name for this phenomenon; put basically anything on the internet, and sooner or later people will try to host arbitrary files on it.
I'm pretty sure that's a key reason that google accounts are limited to 15gb now until you pay for more storage. When it was unlimited there were all these opensource projects coming up with ideas to backup your filesystem to gmail and such which got even worse when Drive came about. These free services need to foresee that that will be an issue and put in some basic limits.