I see no one's commented on Global Privacy Control. It's essentially an HTTP header that's supposed to be legally binding with the California Consumer Protection Act (CCPA); unlike DNT.
There's a setting on Firefox (Beta at least) that enables it.
GPC is already the law in California, but it seems the EU has yet to catch up, possibly because of how enforcement failed by being delegated to national DPAs, some of which like the Irish ones are clearly captured by the surveillance-industrial complex.
The EU learned its lesson. DSA and DMA enforcement is not left to national authorities. The Irish DPC clearly thinks it is a subsidiary of the IDA, the agency charged with attracting multinational headquarters to Ireland.
There's a setting on Firefox (Beta at least) that enables it.
See:
https://globalprivacycontrol.org/
https://global-privacy-control.glitch.me/
https://privacycg.github.io/gpc-spec/