The rest of the demographic data like age, location, preferences, etc are used for users to be able to conduct segmented audience queries.
Example: I want to ask a parenting question, to women between 30 to 45 years of age on Chicago area...
By the way, we do not intend to sell data or rely on ads business model and this is why we opted to incorporate a more transparent "paid" service. So, the user data is safe and not going to be exploited like on many other social media platforms.
Hope this helps understand the purpose of the type of data collected.