Apple blocking ads that follow users around web is 'sabotage', says industry

New iOS 11 and macOS High Sierra will stop ads following Safari users, prompting open letter claiming Apple is destroying internet's economic model

For the second time in as many years, internet advertisers are facing unprecedented disruption to their business model thanks to a new feature in a forthcoming Apple software update.

iOS 11, the latest version of Apple's operating system for mobile devices, will hit users' phones and tablets on Tuesday. It will include a new default feature for the Safari web browser dubbed "intelligent tracking prevention", which prevents certain websites from tracking users around the net, in effect blocking those annoying ads that follow you everywhere you visit.