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If a business cannot survive without it essentially stealing my property (read: my data), it should not survive.

This is copying, not stealing though.

But I agree, taking advantage of me telling you personal info by selling it to externals is unfair without consent

Steal has a bit broader meaning, e.g. 'to steal a kiss', taking without permission.

and yet these companies consider piracy stealing too, thats just copying for free without consent, where's the difference?

no difference, both is illegal without consent

I'm sorry, what data is stolen? If I remember your name after we meet, have I stolen your data?

If it's about remember a name - b/c it was given by choice; so that's ok.