They do provide a pretty lengthy legal contract and terms to developers, which are partially outlined in this article. I think they just realize that the ball is in their court, and if the company wants to sue them then that is when they present the evidence.
I agree that it would be helpful for people that legitimately don't know and may have made some minor mistake to get more information to correct it, and prefer businesses be transparent when implementing their policies, but from a purely legal perspective it makes sense why Google doesn't do this.
This is literally what each and every company does - P&G could sell me the toothpaste cheaper, but guess what, they want my money. Very rarely a business deal - money exchanging hands - is "fair" to everybody involved. What would you expect, somebody stop trying everything to make money because of the "greater good"?
The fact is, as bad as Google is sometimes about user privacy and „borg behavior“. Their adversaries (malvertising, spammers, clickfarms, bot-armies, state actors) are so committed to manipulating humans for money and/or influence, that they must be hindered wherever possible. It‘s the war for attention. And it‘s only going to get more intense.
If enforcement can't be managed at that scale, things of that scale should be shut down. Platforms are not an inherent good.
Sure you could go back to selfhosting. But monetization and, more importantly, discovery will not work that way.
Or we go back to the days of yesteryear with vetted and sanitized gatekeepers (also beholden to advertisers) in place.
So yeah. Until there is a empathetic, nuanced AGI/ASI in charge of policing content there’s not gonna be a good solution. That might take longer than a while.
See, if a company can do something for years then the least thing you can do is explain why they've been banned, 'policy violation' is such a great fig-leaf for a lot of trickery that it should be a requirement to spell out exactly what the violation was unless the account was only a few days old and did not have a history of good behavior right up to that point.
If Google wants to hide behind the mantra that they do not wish to tell the world what rules they have to avoid giving spammers an edge then they should improve their enforcement; not to send away the bulk of the complainants without a way to improve or some kind of dialogue.