Because it's so risky and dangerous to leave cold turkey, most ex-muslims just put up with the shenanigans to keep the family happy, but will inevitably preach a different kind of Islam to their kids, be supportive if they leave.
I was thinking of taking this strategy but two things would get in the way of this
-1) Muslim parents live with their children even after they get married so most grandparents will flipshit at the thought of their grandchildren learning a version of Islam any other than the hardcore one they believe in
2) Me and lots of other people just think that " If I stay in the closet for my whole life will I regret this at my deathbed?"
Most ex muslims in the West will take advantage of their freedoms and come out since it requires ALOT MORE energy to stay in the closet and just think about the life you could have had if you came out.