On iOS at least, ad prevalence has increased over time because targeted ads have been effectively abolished: more ads, with less relevance, are required to gain the same amount of revenue.
it seems more like ad prevalence has increased over time so that advertisers and ad-based services can make more money
after all, it increased before any attempts to rein in targeted advertising (which still exists, it's just harder to hyper-target in some circumstances)
after all, it increased before any attempts to rein in targeted advertising (which still exists, it's just harder to hyper-target in some circumstances)