Lately, we've had a large number of new accounts that come in and upload images that break various rules. If someone gets banned, there's nothing preventing them from creating a new account and doing the same thing. My user blacklist has been growing on a daily basis and will likely be soon full.
If we prevent users from being upload (say for 48h or 1 week), I think it might cut down on the amount of garbage that has to be reported and might make life easier for the moderators. I don't know if we have that capability, but just a thought to help control the influx of rule breaking content.