If you're paying for a subscription, the company might sell your data. If you're using a commercial service for free, they are certainly selling your data.
Having said that, you're right to be suspicious of commercial services, even that you pay for. Someone can found a startup with a strong commitment to customer privacy and the best of intentions, but a few acquisitions or near bankruptcies later, those commitments will go out the window.
Relevant to this case, since they have a free version and premium one, they would probably just sell data from both sets of customers. It would be leaving money on the table otherwise, right?
The small chance that they might go out of their way to not sell premium users data doesn't seem worth much.
Get this through your head: I. do. not. want. to. be. in. a. relationship. with. you. Using your product or service one time is not consent. Finding partners is hard, but that is no reason to propose marriage on the first date, and that strategy will not work well. No means no.
…now imagine a list of instruments, some of which have durations specified in days/weeks/months (problems already with the latter) and some in workdays, and the user just told your app to display it sorted by duration.
> Where is the line between a spelling/grammar/tone checker like Grammarly
For me, the line is precisely at the point where a human has something they want to say. IMO - use the tools you need to say the thing you want to say; it's fine. The thing I, and many others here, object to is being asked to read reams of text that no-one could be bothered to write.
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