This page says what Estates holds about people, why, who can see it and how long it is kept. It is written to match how the product actually works. Estates is operated by Kubinu Geospatial Limited and Data Druid Tech Services Limited; each estate that uses it decides what goes on its own register.
To let an estate bill its levies, give receipts, know who is in arrears, and let its gate recognise residents' cars and expected visitors. Nothing is used for advertising and nothing is sold.
Gate records are deleted after the period each estate sets (one year unless the estate changes it). Register and payment records are kept while the estate uses Estates, because they are its books. When an estate leaves, its data is exported to it and then deleted on request.
Data is held on servers in the European Union (Finland) and on the phones of the estate's staff and residents. Connections are encrypted. Plot photos are stored outside the public web folder and are only served to signed-in staff of that estate.
Under the Nigeria Data Protection Act you can ask to see what is held about you, have it corrected, or ask for it to be removed. Ask your estate office first, since they keep the register; or write to enquiries@datadruidtech.org.ng.