I think the first heads-up version to the public only allowed 10,000 origins to be blocked, meaning that advertisers would only need to purchase 10,001 domains and they would be able to send ads to users again.

It's been a point of sour discussion with the chrome web team for years. They've tried to adjust it to make it more palatable with the public but advertising is just too important for Google to implement the API that users want.

Google has gone so far as to use its resources to silently take control over the web to ensure that ads remain, first with AMP based web pages, and then with FLoC advertisements. Now they've replaced that with Topics but many are eyeing that very cautiously.

Also it's just going to be totally crippled once manifest v3 extensions are mandatory