The software extension’s default setting allows for “acceptable ads” to be shown, and more than 90 percent of its users don’t change that default setting. 1
In a move that might have been expected, some ad- and tracking-blocking plugin companies have now, after gaining a significant amount of users, changed the premise of their promise to the users by showing ads and selling tracking data. 2
Currently it seems like it’s still possible to opt-out of the tracking experience, so the advice is to keep an eye out for changes in the EULA and to keep those settings up to date.