I just realized the SameSite cookie errors are only shown in Chrome Beta 90, and are NOT shown in Chrome 89.

So those can't be the cause of the invalid clicks since most people don't use Chrome 90 yet.

Found something interesting.

Taken directly from the AdSense Support website ([support.google.com ]):

We've added a new control to the "Ad serving" tab in your account to let you choose whether you want to allow first-party cookies. To access the control, click Blocking controls and then All sites and then Ad serving. The control is available from today but your choice won't affect ad serving until October 16, 2020.

The invalid clicks started in November 2020 for me, and in the message above, Google said the feature wouldn't affect ad serving until October 16, 2020, which is pretty damn close to November.

Essentially, this feature might've been broken from the get-go, but had never caused any issues until Google tightened its Invalid Clicks policy (I only started getting the Confirmed Click penalty at the end of February 2021). The weirdest part is it doesn't seem to affect everyone.

So there is probably some combination of factors that is causing the invalid clicks, and not just First-party cookies alone.

@Janvitos
Hello
For my site too, invalid clicks from France have disappeared from April 1, 2021 without my making any changes to my code.
So I think that it is adsense which made a modification in its system in order to block clicks
But as you can notice it at home too, the impressions always continue on the blocks already archived and not appearing on the site.
We must therefore continue our research in order to also stop these impressions, because otherwise the clicks can resume at any time.
I will also exploit your idea of ​​SameSite at the level of my htacess.

@janvito

Allow first-party cookies on your site
Allow first-party cookies on your site to support features like frequency capping and spam protection when third-party cookies aren't available.

I feel that what you're really doing is disabling adsense from detecting fraud clicks automatically when you disable this and thats y the invalid clicks go down.

Im honestly beginning to feel once your targeted there's no way of escaping this..

@Nickmns i did try the frame busting js, but since i have auto load articles it did not work....im honestly begining to feel the clickers aren't hitting my site at all.....

the ads that are being clicked are ads that were used over a month or two or more ago and are not even on the site.... its not cloned its not in an iframe after everything done ..... their pulling in directly from adsense and clicking it .... not from my site for sure

@friedclyde

But if you look in the report of your site, you will see that the clicks are coming from your site, even if these ads are already removed from the site.
And over time, adsense can penalize you for that, it has already been the case for me

Hello,
@Soprano @janvitos Have you found a solution since?

I have the same problem except my clicks (on my deleted ads) are coming from UAE. No Trafic on Analytics or my Apache's logs ....
I turned off first-party cookies, but it only reduced the clicks a bit.
I disabled iframes, configured Cloudflare firewall and bot rules, but nothing works

My account is not banned for the moment