FTP sites will be marked as Not Secure with the release of Google Chrome 63 in December 2017
Thats the direction of the discussion at https://groups.google.com/a/chromium.org/forum/#!msg/security-dev/HknIAQwMoWo/xYyezYV5AAAJ
Although there have been plans to remove FTP support altogether, for now FTP sites will only be marked as Not Secure.
FTP, or File Transfer Protocol, used with ftp:// requests is a decades-old network protocol that is used to transfer files between clients and servers. FTP does not encrypt traffic by default, making it susceptible to interception and manipulation by eavesdropping third parties.
FTP can be secured using an SSL/TLS, which in turn creates FTPS. Unfortunately, FTPS is not a widely-supported feature on most browsers, including Chrome, due to its low usage rate.
What are FTP sites?
FTP sites are locations from where you can use your browser to download large files such as the latest Linux OS distribution, or third-party softwares for your operating system.
However, since in time most software distribution services have moved to HTTPS download, and it is suggested the rest do the same.