I'm pulling these numbers out of a hat, but I would wager users with rooted Android devices are below 1% of the mobile user base, and probably below 0.1% of the total user base including desktop.

Counterpoint, installing uBlock in Firefox is a piece of cake, but lots of apps don't work on rooted devices. I know there are ways to hide root from detection, but I don't care to ride that treadmill back and forth.

How many users have rooted Android? Especially people in the west who are worth a lot more to advertisers?

It can’t be that high anymore. All the signals seem to be that rooting is trending down. I could be wrong of course as I have no hard data.

Aren't the majority of users on iOS or unrooted android?