Yes, this is obviously for the purpose of tracking and identify you, your area of interest, your price range.
From these they can form a database for any area, providing information on number of potential buyers, areas of interest, hot localities/houses, search patterns, price ranges, etc. These information would be great data for sale for banks who would like to know the demand in detail and match that with their inventory release rate for any micro housing market. The banks (the sellers of this market) also have the other half of your information: financial status through mortgage application, mortgage preapproval, approvals, bidding patterns, bidding history…..
Information is power for them, the tools that will help them (big banks) to manipulate the market.
You as the individual buyers will be hunted, studied and played with.
I will just start to use multiple multiple MLS so sdlookup won’t get my info. I just don’t like being tracked.