Do you expect Google to do any of these things to OpenAI, if ChatGPT becomes the google killer that some people say it could be? It's very difficult for me to imagine any of that.
OpenAI isn't one person starting a search engine in their garage. But they acquired the reputation and resources to protect them from the behavior you describe through conventional means. And others can do the same.
I expect that when Google faces real competition against their core business they will be assessing the legal risk of every anti-competitive move they make, like every monopoly before them.
Be that buying the competition, dumping to kill the competitors business, slapping them with lawsuits or making their competition illegal through lobbying.
I don't believe ChatGPT-based solution will ever replace Google, but if someone tries and gains enough traction they'll encounter at least one of those issues and be on top of HN for that.
Google will find some plausible excuse, something deep in ToS they broke, competitor will not be able to work around it or reach someone within Google to explain to them what exactly need to do to restore that part of service.
We'll all suspect Google has done so intentionally and maliciously, but nobody will be able to prove that beyond doubt.
Google could buy OpenAI in a heartbeat unless the government stepped in to disallow it. We’ve seen this before with amazing company Figma founded to beat Adobe. Way better product but instead of Adobe dying or having to innovate they bought Figma
OpenAI isn't one person starting a search engine in their garage. But they acquired the reputation and resources to protect them from the behavior you describe through conventional means. And others can do the same.