> there was a general concern of the fact that the data collected might be used against be in some unknown way in the future
I think this is a reasonable concern. But I think this is where it differs from the concern people have with sharing abortion data.
In the NSA case, the concern is in a possible future, the information they've gathered could be used against you in some way.
In the current abortion data case, the concern is:
1. That there are states with laws on the books that would punish you if this information came to light.
2. There are companies with this information in hand that have no legal obligation to keep it private.
3. These companies refuse to make any sort of agreement or promise to keep this data away from those that would use it against you, or destroy the data.
4. These companies are within the legal jurisdiction of the aforementioned states.
The threat here is much more concrete.
Edit: To be clear, I'm not saying that the mass collection of data by the NSA is harmless. Rather, I understand why people are more concerned about the abortion data collection, because the threat is more concrete. The full consequence that NSA data collection poses haven't actualized, but depending on how things go, could be much, much worse than this.