I think you are using an unhelpful definition of "consent", albeit one that is indeed shared by some legal constructs?
The idea that "you consented to me having this info, so anything I can come up with to do with this info is fair game" is obviously bullshit. But that's just because it's quite obviously not really consent, but rather a case of someone trying to justify doing something that is obviously lacking consent. People generally consent to specific uses of information, so if someone is ignoring the explicit or implied purpose of collecting some information, they are really just pretending there is consent.
Which is, BTW, why the GDPR limits use of collected information to specific purposes (which have to be either inherently required for fulfilling some obligation, or there needs to be consent for that specific purpose).
The idea that "you consented to me having this info, so anything I can come up with to do with this info is fair game" is obviously bullshit. But that's just because it's quite obviously not really consent, but rather a case of someone trying to justify doing something that is obviously lacking consent. People generally consent to specific uses of information, so if someone is ignoring the explicit or implied purpose of collecting some information, they are really just pretending there is consent.
Which is, BTW, why the GDPR limits use of collected information to specific purposes (which have to be either inherently required for fulfilling some obligation, or there needs to be consent for that specific purpose).