I use a PC laptop, with Windows 10 Professional. I've used both Google Chrome and AVG Secure Web Browsers. On neither have I ever seen ads within threads. I have seen them as banners at the top of the home page. And Tapatalk is rife with ads again, but I recognize it as a function of using a free app.
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winter4me could you expand upon the browser you're using or whether or not it's using the Tapatalk app? I believe you can upgrade the Tapatalk app to an ad-free version, but that requires a payment. Tapatalk is not created or run by PC, it's a third-party app that numerous web forums connect to for mobile phone browsing.
I wonder if this is either a Tapatalk issue or perhaps something with your browser?
Hope this is helpful. With more information I'm sure the admin team can help figure out what's going on.