The majority of web use for me is not shopping. Why should I use the same browser for shopping that I use for recreational web use.
As for YouTube, this has been brought up many times. I cannot speak for other users, but I see zero ads when using YouTube. I search and download videos from the command line. With very few exceptions I never need to use youtube-dl because the signature values are already in the web page. There is no need for a "Javascript video player" to submit HTTP requests. The Javascript-enabled behavioural tracking on the YouTube website is insane. I use tiny shell scripts to search and download. I am aware of "SponsorBlock" which suggests some videos have ads embedded in them however I have never seen such a video. Most videos I watch are non-commercial.
"Click-fraud" is IMO secondary to fraud on the part of Big Tech and Big Tech wannabes who induce advertisers to purchase online advertising knowing, but not adequately disclosing, that it suffers from such inherent technical flaws.