Most of the notices are implemented in such a way that the tracking is enabled by default and clicking "decline" in the notice sets a cookie saying "opt out" to all the trackers (whose effectiveness is probably equivalent to the "evil bit" in IPv4).
Blocking the notice (or ignoring it) is technically equivalent to opting in. Of course, if you're using a competent ad blocker it's likely that the trackers themselves were also blocked, making this a non-issue.
Blocking the notice (or ignoring it) is technically equivalent to opting in. Of course, if you're using a competent ad blocker it's likely that the trackers themselves were also blocked, making this a non-issue.