I guess the question is how many more $100B of ad sales slots are available, aside from just stealing share from incumbents (who already took it from traditional media channels over last 20 years).
replyAt some point someone needs to add value to the real economy, not just take an ad tax off the top.
I don't think advertising is entirely a zero-sum game (there is real value to everyone for steveBK123 to learn of a product that actually solves a real need or saves money, etc) - but it has to be something akin to it - the economy can't support five hundred trillion dollars in advertising spend.
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