Earlier quoted context omitted.
OpenAI starts from excellent UX and needs to prove that they can monetize all those empty pixels. They will no doubt succeed. Google starts from horrid UX where every advertiseable pixel has been squeezed dry. Only way to go is down.
You're confounding your subjective personal experience with the whole. Google can eat the cake and have it. They already are profitable, they already have scale, they already have market penetration, Google is already installed in 72% of mobile devices, they have cost efficiency due to TPUs, they probably have the best data, at least for serving ads. OpenAI has no chance in outcompeting Google, not in ad-based revenu…
As to the rest of Google's dominant position, it's an advantage for sure, but every leading vendor whose products turned to shit went the way of the dodo one way or another.
And it's important to mention that this includes GAds, not just the loss leader (Search). They have been so good at squeezing advertisers dry that ROI is barely there in many categories.