- bright red or green “OK” button that opts in to all tracking
- muted “save settings” button
But aha, gotcha, the default settings still have a bunch of tracking enabled, so you have to uncheck all of those, then remember to press “save” and not “OK”.
In the worst ones there’s an artificial delay when you uncheck one of the third-party boxes, as if it has to file a form in triplicate for the unusual request of not immediately sending all your account info there.
It definitely happens where they don't give you a 'reject all' option, so you have to go 'select options' or similar and untick each one, or at least each category, and then 'confirm choices'.
As an aside, it's supposed to be as easy to decline as to accept; so if you give a 1 click 'accept all' then more than that (whether two or dozens) is unacceptable.