http://official-gomk.anonblogd4pcarck2ff6qlseyawjljaatp6wjq6rqpet2wfuoom42kyd.onion/p/if-you-re-not-paying-for-the-product-you-are-the-product
Although OnionShare does keep track of visitors and highlights whether someone clicked something, we do not have the ability to just take that data and sell it to some big boss, because we technically govern ourselves. We are not owned by any businesses or any third party. However, we sometimes may rely on third parties to, for example, host our files for us so we can give them away for free, but those external websites tend to be known for their privacy and reliability.