Most services under the "autogeneratelink" umbrella function using a "leeching" system. The provider maintains their own set of premium accounts for various file hosts. When you submit a link, their server downloads the file first (or uses its premium credentials to bridge the connection) and then serves the file directly to you.
The ability to pause and resume large file downloads. autogeneratelink info
Since your traffic passes through the generator's servers, they may log your IP address or download history. Using a reputable VPN service is often recommended. Alternatives for Developers autogeneratelink info
Access to dozens of different hosting sites through a single subscription or interface. How Autogenerate Services Work autogeneratelink info