Search engines arent the issue believe it or not.
The fact that every commercial website has 25+ web/ad functions and 99+ tracking functions (I know this due to my ad blocking software.) just browsing the web provides more data to Google, Amazon etc than you searching for say, Camping equipment.
Every publisher is guilty of this, some far more than others obviously.
They sell search, they track activity just from you being on a Google ad served site. Short of connecting to a VPN every time you go online nothing really stops their vacuuming up of tracking data.