the virus creator sues the antivirus company and wins.
I've worked in Aptoide, they aren't a virus company. They even spent a lot of resources fighting virus but that's always a cat and mouse game and given the amount of resources they have vs amount of users that can publish an apk (everyone) it gets hard.
If you think they are manipulating the published apps, you are free to fork the Aptoide client on github.com/Aptoide and create your own version.