Getting a targeted advertising that is likely relevant to you is probably one of the few positives of tracking.
The issue people have with tracking is not 'what ad am I getting on a given website'. To get a targeted ad they need to maintain a database of privacy infringing information. 3rd parties having this data, and what they might do it with it (or who they might lose the data to) is what many people have an issue with.
Being served a targetted ad is just a strong signal that someone out there has this private data on you.
For example, chances are that google has a pretty rich database of your location history. If not you specifically, they do for most people. You can probably imagine a few different scenarios where someone else obtaining that data could be bad for someone. You're trusting google with it, but is that trust warranted?
The issue people have with tracking is not 'what ad am I getting on a given website'. To get a targeted ad they need to maintain a database of privacy infringing information. 3rd parties having this data, and what they might do it with it (or who they might lose the data to) is what many people have an issue with.
Being served a targetted ad is just a strong signal that someone out there has this private data on you.
For example, chances are that google has a pretty rich database of your location history. If not you specifically, they do for most people. You can probably imagine a few different scenarios where someone else obtaining that data could be bad for someone. You're trusting google with it, but is that trust warranted?