i think it is going to be difficult for them to avoid the death spiral. Lets say 20% of their users migrate to Cgpt or other Chat service. they then need to put up 20% more ads to make the same amount of money. the remaining users then think wow there are so many more ads then before im going to try Cgpt. and the cycle continues. We are now at peak Google. this is what happens to monopolies when their business models are disrupted by new technology, google is no different.