They dont have 8 million members they claim 8 million peak publishers. The evidence says others wise. Take the number of baptized one from year to year and you’ll soon realize their missing members in to tune of several hundred thousand per year. JW facts does a nice break down of these missing ones. Even with the dfd ones and the dead ones it still doesn’t add up to how many are missing. Some one once did a count year by year of baptisms from about 1950 or 60 and showed there are more ex dubs then active ones.
Take out the kids not baptized and all the missing ones and you have less then 5 million baptized members maybe even less then 4 million.