Google makes big money through large scale automation
If they had the review properly done by a human being this would cost google a lot - the benefit to google would be minimal, other app vendors will fill the gap, they have no real interest if any particular app vendor does well or fails. Google does things if many complain: they are getting complaints about spammy & malicious apps and so have put in some automatic tests. Google does not care if automatic decisions are fair or not - just as long as they are cheap and keep the majority from complaining.
It is a very sloped playing field, governments are not really interested as all that they see is that policing this would cost them money.
The mega corporations are too big in very many ways.