I wonder if they're running some malware scanners plus do they have to comply with DMCA takedowns? Based on what I see, the files are hosted on their servers, so they kind of have to, no?
There is end-to-end encryption, so unless they have homomorphic virus scanners I don't see how they would do this...
At maximum 200 downloads and an expiration of 7 days I don't think anyone will bother to be honest.
Hypothetically, you could wrap this storage solution in a service that automatically creates new underlying links as old ones exhaust their quota or expire.