[kjax]

There's another big factor with mobile app users: it's much harder to block ads in a mobile app.

[CodesInChaos]

Don't most users already use mobile browsers (e.g. chrome) which don't support extensions and thus ad blockers?

[Scoundreller]

Firefox on iOS supports strict ad blocking. It’s not as good as some of the purpose-built extensions on desktop, but it mostly does the job.