Google tried to fix the problem in 2019 but it didn't take long for scripts to be written that detect incognito mode. Recently Google again promised a fix but to date still no fix. Basically incognito mode is a joke.
Incognito mode detection still works in Chrome despite promise to fix | ZDNet
Furthermore, developers have taken the scripts shared last year and have expanded support to non-Chrome browsers, such as Firefox and Safari, allowing sites to block users in incognito mode across the board.
Blocking incognito mode detection won't stop advertisers from tracking users in incognito mode, as both website operators and advertisers will still see information such as IP addresses and other traffic data.
Incognito mode detection still works in Chrome despite promise to fix | ZDNet
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