>Apart from evidence that seems to be pointing towards this already happening;
Please provide this evidence. I am getting a bit tired of this misinformation. Organic search and paid search are silo'd. To say that Google favors advertisers in the organic results or the other way round, is simply not true. It would destroy Google's credibility.
>how tempting do you think it would be for Google
It approaches conspiracy thinking. I love that, but I think HN is not the place. You are basically accusing a company of a very evil act, without proper evidence. Do you realize that many Googlers frequent this site? It would be a shame if all they get to read are conspiracy theories and baseless accusations.
>Especially when considering that the rules are so vague that almost every site is guaranteed to break some
Hogwash. Their rules are very clear and succinct.
https://support.google.com/webmasters/answer/35769?hl=en
Maybe if you want to spam or manipulate, then these rules are vague. Maybe when you don't read the guidelines then they are vague. I bet that if you can point to a rule that almost every site breaks, without them knowing, then Google will adjust that rule to be more clear.
You can not please them all.
>Penalize them using a generic message and refuse on principle to answer any inquiries as to why.
You can certainly not please the spammers that were caught with their hands in the cookie jar and then take to the internet to say that Google is unfair, and that the big brands get away with anything.