Why do you use FTP instead of SFTP to upload the feeds?
We use FTP uploads because most shopping engines only support FTP at this time. Also, the data that is in the feed files is data that is publicly available from your product pages, so it is not private or proprietary information. The information does not need to be secure or encrypted.
We do support SFTP uploads on Custom Feeds.
oogle Shopping now supports SFTP uploads, and we plan to migrate those feeds to SFTP at some point in the future.