Mozilla should make all of their Firefox telemetry, Pocket ads and sponsored content, sponsored Mr. Robot addons that automatically install, Cliqz spyware, etc. opt-in before they talk about the defaults of other companies. Mozilla have no shame.
Should this message be coming from another source? Yes, but 'as well as', not 'instead of'. Is it good for user advocacy that a highly recognised source is promoting this message, even if the source is flawed? Yes, it is.
By that logic, you shouldn't care about Mozilla because you can just download another browser.
But that's not true. Venmo and Firefox have an impact on the larger world, whether you use them or not. Both should be criticized. But criticizing the messenger does not excuse the behavior of the other.