Comments - q68txy

1) If you used bittorrent you would provide a http seed to support it. This alleviates all the unreliability claims.

2) If you're using ftp you're not reinventing the transfer but you are reinventing delta coding when you want reliable transfer of large files and updates that don't involve re-downloading the whole file.

3) HTTP is a good choice for serving files on the web especially when combined with bittorrent or something like zsync dot moria dot org dot uk

Bittorrent also provides a guarantee of cryptographic integrity which gives you both security and file validation without any extra work.

So yeah, don't reinvent the wheel, but FTP seems like a really odd choice.