What assurance is there that your private personal data will not be leaked, sold or used for other purposes other than what is claimed it would be used for? How do you determine that your data will not be sold to third party companies for social engineering, marketing and targeting purposes? Further more, what assistance do you have that people who will handle your data will handle it ethically, truthfully and will not personally steal or collect this data to use for other mischievous purposes? You need answers. Ask questions.