Nice service. You should considered a default expiration (a week?) to lighten the load, and an option for multiple downloads (?dl=3) so the first n get a copy or multiple tries if corrupted.
Also, you don't keep logs but what about your cloud provider? What guarantees can you make about them, and what responsibility do programmers have to explain the risks to the public? It seems wrong to say "anonymous and secure" without some qualifiers: you must use https, unencrypted files might be copied by the cloud provider, etc...
Thanks for the helpful feedback. Yes, I think a default expiration is a good idea and will be adding this. Other have asked about the ability for multiple downloads, so I am considering this.
Large files could become a problem, since any request causes the file to be deleted. There is no chance to retry. But, this is the most secure way handle file deletion.
You could offer an option that would delete the file after X% of bytes are downloaded.
I have been working a simple server to do just this, I am calling it a nonce file server. I have been coming across times when I need to deliver a file once, and only once.
https://curl.io/ has been doing that for a while. 20GB file size limit, deleted after 4 hours. I've used it here and there and its useful for quick, temporary storage.
Cute. Potentially useful. It would, of course, be a disaster for you if its use took off and you ended up handling a lot of illegal material, or even if it were enough of a success that you used a lot of bandwidth.
The oneshotness of it does mitigate that a bit. If someone wants to share material with N people they have to upload it N times, which rate-limits (ab)use.
I think the file size limit is currently 500MB, but I may try to increase this at some point. There isn't any lower time limit than one day right now, but thanks for the feedback - it would be cool to have, so maybe I can add it soon
Time limits of a few minutes would be useful, but if you do that make sure you time from upload complete to download start and don't expire things in the middle of a download.
It's a very simple yet useful idea. It might be cool if you could specify your own link. That way you could tell someone in advance to check file.io/someLongRandomString in the future .