What's different to so-called 1-click hosters (rapidshare, mega, uploaded, ...)? What's your business model? How do you want to keep DMCA claims at bay? Does this work mobile?
The main difference is that nearly all of these hosts specialize in a specific type of storage. As an example MEGA forces all users to client-side encrypt files before uploading which is useful for sensitive files, but it comes with the cost of incompatibilities with older browsers and devices which can't decrypt/download the files.
Uploaded provides lots of space for the uploaders, but then pushes all users to its premium plan. The site is ridiculously slow to use as a free user as they cap download speeds to 50 KB/s (they bump it up to a 70 KB/s if you take the time to sign-up).
NoFile bundles all the perks of the different hosts and gives the user more options and fewer limits. You can upload large files and choose whether you want to password protect, encrypt or disable previews for your file while still giving the downloaders speeds of at least 2 MB/s.
It's just a simple file host that allows you to share files without having to worry about the downloaders being infected with a virus, not being able to download
What's your business model?
At the moment there is no revenue source. As costs for the hosting go up, there will be a more "humane" premium plan added in the future, but it will targeted to very frequent users and as a free users you won't be affected by the changes.
How do you want to keep DMCA claims at bay?
If a valid DMCA request is sent in together with a link then we will be forced to respect the content creator and take the link down.
Does this work mobile?
This works on every single device regardless of whether you have Javascript enabled or not. If you however enable the client-side encryption feature (currently in BETA) which is disabled by default then users on older browsers and devices won't be able to download your file.
So what makes you think your fate will be any different than that of all the other free file hosts that have had to resort to advertising in order to survive?
I don't mean to be negative, it's just that I've seen the transition from free to freemium to ad-supported to Rapidshare to dead happen over and over again. These services don't seem to operate with large margins - from the outside, it looks more like all of them are on the brink of bankruptcy.
Lets imagine our average citizen uploads quarter of a gigabyte, that means 4,000 visitors uploading files per $10 client. Assuming you can keep other costs really low, it's not too outrageously expensive.
Rapidshare was a service that had to swiftly and reluctantly change their business model. They were operating out of large offices with over 60 employees and due to the change they saw a sudden drstic drop in revenue.
Rapidshare's financial information isn't public since it's a private company, but one could argue whether they were actually losing money or not making the profits that they expected at the time of the shutdown.
Then came the FBI raid against various filehosts. I remember few of the other hosts got taken down and charged, while others shut their site down as precaution. I remember Rapidshare starting their decline during this phase, something tells me Rapidshare did it on purpose and 'ran away' with the earned money before the feds got them.
Well thats my theory :)
In plain-English, what does this mean?
The most concerning aspect of your model is charging users for download speed. That might cause users to pay you, but it puts an incentive on business to host questionable content. Megaupload and Rapidshare were doing the same thing.