Nostr doesn't stop data collection. Nostr makes data collection easier, the power of it is that it is for anyone who chooses to collect it.

Your data can't be bought or sold for it is free to anyone to do so as they please.

This means as an Individual you can have a website build, a custom restaurant recommendation, even a better interest rate all from one source that both parties agree is fair. And the data? Just melts in no scrubbing no double entry. Just one clear note chain of data.