Yes, they re-launched contributor as a "opt out of ads on a per site basis" instead of the old global "show me kittens or blank space instead of all Google ads". The reasoning given was it was a " better experience" to have no ads on a page at all instead of a mix of Google ad kittens and non-Google regular ads.

Fine, but there are only two sites that support it, so it's fairly useless. Maybe Funding Choices will make it more useful.