Google is now marking EVERY SINGLE APK at our repository as "Malware site issue". Congrats, "Safe" browsing.
Of course there is not a single malware there, everything is scanned multiple times. And I bet they excluded *.google.com from their scan or the entire PlayStore would be red by now, too…
Calling out to all of you: Please use https://safebrowsing.google.com/safebrowsing/report_error/ to report the links as "safe"!
https://apt.izzysoft.de/fdroid/repo/com.apkupdater_52.apk is the one console reports.