This is clearly false. None of Nvidia, AMD, or Qualcomm manufacture their own chips. These companies are valuable despite not having in-house manufactures, perhaps because of it.
This is not new. Safari has been blocking third-party cookies for a while. Even Chrome offers this setting now. With that setting turned on, Chrome will also block Google Analytics when you are not on a google.com page.
Loss ratio is a specific measure in the insurance industry. You don't need to get to 0% loss ratio for the company to be profitable and ~70% loss ratio isn't bad for a relatively new company. Typical P&C insurance companies have loss ratios ~ 50%.
> I suppose it helps to see precisely who is paying for an advertisement, but I don’t think this is actually useful in a real sense.
Think from the perspective of an advertiser. Earlier, an advertiser could pay for any ad anonymously. Now any ad you want to show can be traced back to you. This is a meaningful difference. Even if you as a viewer can't pinpoint the specific person behind an ad, they are not completely anonymous anymore (to Google, to law enforcement that may have a warrant, etc). Of course, this change comes at the cost of a reduction in freedom from the lack of anonymity.