Kohli predicts that the global AI sector will be worth $150 trillion by 2025. The total valuation of the internet is $50 trillion. This is not GDP impact. The US Internet provides a $2.1 trillion boost to GDP. It is likely that the Internet boosts the world GDP by about $6-8 trillion. Kohli is predicting something like an $18-25 trillion boost to Global GDP by 2025 because of AI. This would be about a 4% per year boost to world GDP Growth. Although it will likely not be evenly spread with more in the later years.
Price Waterhouse estimates that the Internet will boost the world GDP in 2030 by $15.7 trillion. This would be more than the current output of China and India combined. $6.6 trillion is likely to come from increased productivity and $9.1 trillion is likely to come from consumption side effects.