I remember back around 2010 I used to laugh at people who put duct tape over the camera on their laptops. I thought that was paranoid nonsense. Now after Snowden and all the rest, I’m convinced various governments and companies are able and do routinely track all our devices, including recording audio and video from our devices if they wish.
Does WT have the ability to track using cookies? Perhaps. Would they be bothered to do so? Probably not. If they did would they find anything interesting? Depends what you consider interesting. I use their website and app and I’m not worried if they track me. I can’t imagine what they’d use against me or how, but perhaps I lack imagination. In the current political climate I’m frankly more concerned that the authorities will take exception to my views on Ukraine or Palestine than I’m worried about Watchtower reacting to my views on say the blood ban or shunning.