You are missing the point. Google/Bing takes what they scrape and incorporates it into a publicly facing service. Ditto with pushshift.io. You didn't mention this, but ditto with LoyceV. Suchmoon on the other hand is not running a publicly facing service.
Maybe a better way of explaining the situation is like this: sites such as walletexplorer, and entities such as Chainalysis, and others who analyze blockchain data to group transactions to be belonging to a single person/entity are using public information that anyone can look at, however they nonetheless attempting to harm the privacy of those who use Bitcoin. Their goal is to reduce the privacy of those who use Bitcoin. The business model of ChipMixer, the entity that is paying everyone in this thread to advertise for them, is to get people to pay/donate in exchange to be able to maintain their privacy while using Bitcoin. Obviously ChipMixer would not sponsor an entity such as Chainalysis to attempt to break the privacy of Bitcoin users.
I think this subject really deserves its own topic . Not about suchmoon x quickseller, but about analysis on public/private data.
Google Bing are not using only public data, they use private data as well (as your search history, email content, history of downloaded apps etc) , and they work with those data. This is completely different.
Services like wallet explorers are not harming users privacy imo. If you decided to publicize your personal data, anyone is free to work with this data. You should be worried about your privacy before , not after you post it. If you care about it, use a mixer and wallet explorer can't harm you anymore. I believe that wallet explorer may be even good for Privacy services like chipmixer, as it shows your privacy leeks and points of failure. It is better to know where your privacy is weak than to just ignore it.
The analysis wallet explorer does can be easily done by anyone who wants to investigate you. If you can investigate yourself for free, you know where and how they can find you. And you can work with that
Making data analysis on forum posts doesn't harm anyone's privacy imo as well.