In other words, google knows so much about the visitor to be screwed by regulation, hence they want to wrap the coarse-grained moat as helpful topics for advertisers. Meanwhile not exactly share that info with anyone to not lose their moat benefit either by removing third-party cookies effectively killing other data harvesters’ moats and become the one true eye of sauron(or politely called as monopoly).
But the topics API is available to anyone to use right? So in a way they're getting rid of their moat because they're closing down a datasource where they are market leading and opening up a new data source where everyone gets access for free.
