Although blocking at the root level through PiHole, AdGuard, PortMaster and others, block some ads and trackers, they do not block all of them, they do not full work for example on YouTube, Amazon and other sites, which use tracking techniques that are not intercepted at the DNS level (Fingerprinting, Header,CSS,Font, WebRC, Pixel (Facebook), Keylogging (M$ with TowerData),etc…)
A definitive solution can only be achieved by outlawing surveillance advertising practices and techniques, if not, the only thing left to do is to limit yourself to using only decentralized networks, which, on the other hand, have their own problems regarding security or, in general, to use only a product or service that does not use these practices, but this is almost impossible, since most of the services and products on the network are American, where these surveillance practices are quite widespread to earn money, even in FOSS.
As a user you can only try to avoid the thickest, using a VPN, certain extensions, some analyse tools (Blacklight, Unfurl, etc), and above all with care and common sense, but for this you must first know these practices and, as I said before, read the TOS and PP of everything you want to use. .
Although blocking at the root level through PiHole, AdGuard, PortMaster and others, block some ads and trackers, they do not block all of them, they do not full work for example on YouTube, Amazon and other sites, which use tracking techniques that are not intercepted at the DNS level (Fingerprinting, Header,CSS,Font, WebRC, Pixel (Facebook), Keylogging (M$ with TowerData),etc…)
A definitive solution can only be achieved by outlawing surveillance advertising practices and techniques, if not, the only thing left to do is to limit yourself to using only decentralized networks, which, on the other hand, have their own problems regarding security or, in general, to use only a product or service that does not use these practices, but this is almost impossible, since most of the services and products on the network are American, where these surveillance practices are quite widespread to earn money, even in FOSS.
As a user you can only try to avoid the thickest, using a VPN, certain extensions, some analyse tools (Blacklight, Unfurl, etc), and above all with care and common sense, but for this you must first know these practices and, as I said before, read the TOS and PP of everything you want to use. .