Just turned AdSense ads back on yesterday after a fortnight's (civilised) back and forth with AdSense support, and several hours of code tweaking, having being told I was "mimicking".
The real issue I suspect was that the rules have been tightened while my site stayed much the same, in particular with a banner under my main page header, which is now officially verboten.
It's a shame that I'd also wasted many hours about a month ago finally fighting off the direct image search hotlinking by Y!/Bing and G that was soaking up 4TB/month of bandwidth while sending me fewer visitors and flattening my servers.
Anyhow, I'll find out over the next week or so I suppose if I've fixed things to G's satisfaction, or else if I get another policy violation warning.
(Apparently it is now possible to make as many appeals as necessary to get a suspended account re-enabled, but I'd turned most ads off with my 'emergency switch' before things got that far.)
It took several back and forth emails to establish what was meant, and "mimicking" IMHO is not a good term for it.
Putting ads where people might be expecting nav seemed to be a big issue, though an AdSense video on the same page as the guidelines I was referred to still appears to advocate doing so. I thought I was fairly neutral and simply following AdSense's heatmap. I have certainly never deliberately aimed to confuse visitors into false clicks.
Also, having an ad banner below the main page headings now seems to be regarded as 'mislabelling'.
I always felt that the AdSense advice to publishers to help make ads more visible and encourage the surfers to follow the ads (which always seemed like good advice to me) came pretty close to contravening the policy intended to avoid displaying ads which would trick surfers into clicking on the ads.
It seems that they do want to have their cake and eat it.
Well, to put a good spin on things, G probably wants publishers to be creative and innovative and successful as possible with the ads without causing false clicks. The reverse might be Soviet-style fixed take-it-or-leave-it templates.
It's just a shame that so many scammers attempt to game the system, leaving G only able to describe issues obliquely...