FileDrop can run directly on your PC, temporarily turning your computer into the host.

You don’t need a domain, paid hosting, or server configuration. FileDrop automatically tunnels your files to the web, making them accessible from anywhere. After the upload/tunneling is complete, your PC does not need to stay online — you can turn it off and the files will remain accessible.

Blossom, in contrast, works like a traditional CDN.

It requires a domain, a server, and proper setup. If your Blossom server goes down, your files immediately become inaccessible. You can mirror your files to another Blossom server for redundancy, but that requires maintaining additional servers — which can also go down.