The vast majority of these have been doable for a decade with open-source, permissively-licensed add-ons such as uBlock Origin so they're quite late to the party (especially when they could literally bundle the aforementioned add-ons as built-ins), not to mention that a lot of these only work on the strictest level of tracking protection which isn't enabled by default - providing a false sense of security to less technically-savvy users.
You could argue that they're doing nothing in the sense that they're not doing anything extra that other browsers (who don't boast about privacy at every possible opportunity) don't already do. For a browser & company that makes privacy claims all the time I'd expect them to be ahead of the others, especially when permissively-licensed solutions exist that can be bundled with little effort.
> You could argue that they're doing nothing in the sense that they're not doing anything extra that other browsers (who don't boast about privacy at every possible opportunity) don't already do.