Data and accessibility services for persons with disabilities
Many people have privacy concerns particular data as more personal and sensitive than others, I think people's privacy concerns differ according to the purpose for which data is collected, with the contrast between service and surveillance purposes most paramount.
People must know for which purpose data is used and weigh the benefits that providing their data may offer them. When these benefits are of immediate personal relevance e.g. accessibility, medical, access services, I think most people are willing to share their data.