Jehovah's Witnesses is a religion based on the business of selling books. That is why the term "Publisher" is used when they refer to a fellow member. Businesses collect data on sales to help make decisions. Jehovah's Witnesses literally were door-to-door salesmen for the Watchtower Bible and Tract Society. That was until the 1990s.
Fears over losing their religious tax exempt status in the U.S. caused the Watchtower to change its model. Instead of selling their printed products, publishers were to "place" them with interested ones and then make that person aware of the donation process supporting the "World Wide Work." This model failed as a business plan.
As a result we saw many changes come and come quickly. Hardbound books were replaced with paperbacks. Watchtower and Awake magazines were reduced in the number of issues published and the number of pages. A new digital format has been adopted requiring members to download publications on their own devices.
Why the change again? For legal reasons. I see the same being true with maintain records on members with the recent privacy laws being passed in Europe. I could see members having to log into an account and report their activities with the servers being based in Wallkill, New York.