The implementation within Chrome isn't a community thing that anyone can make use of. They are controlling who can use this feature. That is vendor lock in.
Which is not to say I'm fond of advertising tracking like this by any means, I hate it, but if we're going to have it foisted on us by Google et. al. then it should at least be managed by a more competent group than the W3C.
https://www.eff.org/deeplinks/2017/07/amid-unprecedented-con...
https://www.defectivebydesign.org/blog/w3c_sells_out_web_eme...
The burden of proof for not being corrupted lies with the people and organizations that wield tremendous power.
We can't just have blind faith and wait for proof of corruption first. Instead we should assume it, and look for proof that there isn't any and be thankful when that's the case.