All modern adtech is a terrible idea.
Let's go back to banner ads that are "targeted" based on what type of website you're looking at, rather than based on vacuuming up as much private info as possible about users.
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Say, for example, an payday lender buys a banner on example.com/r/povertyfinance – could that not be construed as predatory in the same way as building a poverty FLoC based on browsing history?