Has anybody actually looked up Privacy-Preserving Advertising?
This is Firefox’s attempt at removing PII from advertising. This is the opposite of what all ad networks do. The browser keeps track of what ads you’re shown, and whether you’ve visited the advertiser, and encrypts the data and sends it to an aggregation service that will then generate a report for the advertiser.
This is a trial service that they are currently testing with a small number of advertisers. This is probably why it’s opt-out. They need data to determine its effectiveness. Could they have been more upfront about it? Sure. Are they evil for doing it? Not a by a long shot.
Put your pitchforks and torches down. This is a nothing burger right now.