Never in nearly 20 years of publishing ads on the web.
Google uses AI to analyze ad traffic and their AI flags based on what they consider suspicious patterns.
The message you posted that you got from Google was fairly clear on why they flagged your site.
We found potentially invalid traffic being used to generate ad revenue on your account. As a reminder, invalid traffic is strictly prohibited by the AdSense Program policies. Clicks on Google ads must result from genuine user interest. Publishers may not ask others to click their ads. This includes asking users to support your site, offering rewards to users for viewing ads, and promising to raise money for third parties for such behavior. Additionally, clicking your own ads, automated clicking tools or traffic sources, robots, or other deceptive software are also prohibited.