Hi @enache34,
Site Kit does not place ads on a users site unless a user actively chooses to connect the AdSense module, and then allows the plugin to insert AdSense code. You’ll see in the screenshot below one of AdSense module setup screens (this reflects the process for a user who already has an approved AdSense account and site).
Note also that the AdSense module is not connected after setting up Site Kit.
If you wish to revisit using Site Kit for your website, I’d be happy to assist you with any queries you may have. There is no requirement to connect the AdSense module after setting up the plugin.