andrewnz-nz commented:
The URLVoid shows reports from about 20 websites that report unsafe URLs.
The only 'detection'/issue with gnome.org or ftp.gnome.org is on the VirusTotal report, just one by 'CRDF' ( https://threatcenter.crdf.fr/ )
https://www.virustotal.com/gui/domain/ftp.gnome.org/detection
https://transparencyreport.google.com/safe-browsing/search?url="">