You already see some of it. A line for invalid clicks in your ad platform reports that goes up. A session in Analytics that lasted less than one second. A form fill with a real looking email and a phone number that does not connect. A CPA that drifts up for no obvious reason.
Those are the pieces that made it far enough to get counted in your reports. What you cannot see is the rest. Bot traffic and automation tools, as well as malicious AI running inside a real browser. Click farms. Proxy and VPN networks cycling through addresses. Scrapers and crawlers that never touched an ad and still land in the analytics you report on. Form fills with a real looking email attached to nothing.
ClickCease runs 2,000+ enterprise level behavioral and technical tests on every visit and sorts what it finds into distinct threats. Invalid bot activity, suspicious activity and malicious activity, per campaign and per platform. That is a breakdown you cannot get from the ad platforms or Analytics alone.