Instead you get "stupid prompts from mobile Safari" to install apps, which websites mostly do so they can send you push notifications: same prompts, even more annoying (as often the "carrot" is that some of the content or UI requires the app).
Honestly I don't see a lot of those anymore. Perhaps it's the ad blocker, perhaps it's the fact that they realized it doesn't work well, or perhaps I just don't go to sites that push it.