My perfect world would have a law against advertising in general. If someone's paying you to say something, it's a conflict of interest and illegal.

Hopefully, the vacuum of people needing to know things would result in better independent Product reviews.

And the vacuum of not spending 30% of your company budget on advertising would hopefully lead to sinking prices and people being more willing to spend on things that were previously funded by advertising.

Mozilla has never given us a choice to pay for Firefox.

Sure, but I don't think that really changes anything here. The idea of a law that bans advertising when the customer pays you would miss a huge portion of advertising and data collection including Firefox.

I read their post as banning it when the advertiser pays anyone else?

I may have just misread it, but how would that work? When would an advertiser not be paying anyone else?

That's what my third paragraph was for.

Is the concern you want fixed only that paid products still collect and sell data?

I may have misunderstood you, but my read on the third paragraph was mainly that Firefox, in this case, could still have a free browser that collects and sells data. That rule would just add one more fsctor for them to consider if they ever want a paid browser, they both need a viable market and be willing to give up the option to sell data.

Sounds reasonable.

But I highly doubt it removes the want for private data, though. Tracking is also there to measure performance, do AB tests, etc etc.

I'm sure such a broad sweeping law would solve some. But it won't make the ad industry suddenly "good" or go away, or get purged or such.