ChatGPT gets facts wrong and claims certainty while doing it.
An example of media coverage of the former pope’s Jw cousin here:
https://jwtalk.net/uploads/converted_files/145934=8022-PopesCousin2005-08-21.pdf
I was basing my comments on the size of JWs in Italy on the publication quoted below, and while it’s true that the Romanian Orthodox Church has now overtaken JWs because of immigration, they are still much bigger than other Christian groups such as Pentecostals, Waldensians, Mormons and so on.
Today, of all the Christian churches and denominations in Italy, Jehovah's Witnesses are the largest Christian community after the Catholic Church. Although the Witnesses make up less than 1% of Italy's population, this percentage represents a quarter of a million active adherents or "publishers" -making Italy the country with the largest number of Jehovah's Witnesses in the whole of Europe, and the fifth largest in the world (after the United States, Brazil, Mexico and Nigeria).
https://www.cambridgescholars.com/resources/pdfs/978-1-4438-9446-3-sample.pdf
A fuller comparison can be found here.