They provided no information. I have just sent an appeal.
All search engine traffic 99,9% (Bing + Yahoo). All sites in local sector. All US traffic. No Google traffic. No invalid activity in logs, no bot traffic. No deceptive ad placement.
Account always had less than 0.x% invalid clicks.
I don't know what to say. Suddenly after 10 years they don't like search engine traffic, this is hard to understand.
Seems similar to this thread where the webmaster also had Bing and Yahoo traffic:
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webmasterworld.com...]