Rabbi Avigdor Miller, tzl states that anyone, like Paroh, can have his bechirah taken away by HaKodesh Barchu in certain inyonim. How that relates to Acher, ben Dosai and others, I don’t know.
I’m not familiar with ben Dosai, but I always had my own thoughts on the other two cases.
Pharaoh’s free will wasn’t taken away from him — rather it was restored to him.
Acher’s free will to do teshuva wasn’t taken away from him — rather the bas kol said that even if he did do teshuva it would not be accepted. (I have problems with this approach too, but that’s for another time).
The Wolf