Who said anything about bugs? The point is to do something
proactive to stop apps that don't conform to your policies (whichever they may be - maybe you don't allow collection of data, or using a specific interface, definitely not malware, etc.) instead of just reacting, and even that too late.
Apple is at one extreme blocking even legitimate things for obscure and esoteric reasons. Google is at the other, letting all kinds of crap in the store only to review it later, maybe. [1]
I'm sure my remark ruffled feathers on some Android fans but it doesn't make it less true.
[1] https://venturebeat.com/2018/01/30/google-play-removed-70000...