How do playmarket, steam and other platforms filter malicious applications?

Question

Malware

What prevents developers from putting an application with a virus or a miner inside on the platform?
Which companies filter and protect their customers and how?

Answer 1

They have some kind of automated checks, like antivirus, but with a wider range of metrics. However, cases where malicious code is injected into an application that used to behave decently happen.
The details of the implementation of such checks are usually not disclosed by companies, because. this would make it easier to try to bypass the system.