Do traffic bots exist on iOS?

Hey, help out programming noob here please.

Do traffic bots (ones that usually come from paid ads) exist on iOS? and if they do, how common are they online? I'm trying to filter PPC traffic and noticed that the source I'm using has significantly high engagement on iOS than android phones and all the obvious spammy traffic runs on Android according to analytics.

I was wondering it was coincidence or there's a programming reason behind it.