Why keep data-do-not-track when it's deprecated/dangerous?

[JulesFiliot]

Hi everyone,

I was looking at the data-do-not-track parameter that was added recently #3295.
It seems like a great idea however this property is deprecated and seems to be harmful according to the article bellow:

The feature is therefore useless. Moreover, it is harmful as it leaves more user fingerprint in the header, which can be used to track users even more.

https://developer.mozilla.org/en-US/docs/Web/API/Navigator/doNotTrack

Is there a good reason we would like to use this feature and allow people to use it?

Thanks in advance for your answers, have a nice day!

[felicio]

Cc @mikecao

[mikecao]

It's there for anyone who wants to use it, but agreed it's not very useful. It's only a tiny bit of code in the tracker and all it does it check if the value is set. It does not set any headers. That is still up to the browser.