If they do this, they are effectively persecuting people that just want to live their lives without submitting to their cult.
They should try treating people a bit better and probably wouldn’t have to deal with this issue of apostasy. People that want to leave other religions, are not harassed in any way to stay, or pushed to leave, the door is always open if they want to come back (as in the parable of the prodigal son), but they are not put in this with us/against us situation.
I can only speak for Catholicism, but I know it is true for most of the other mainstream religions, not so for psycho-controlling-cults.