Let's say you're a Baptist. At what point do they tell you that you can't attend other churches or read anything critical of the Society?
They don't.
I went to a Baptist church for a while because I liked the preaching. I asked the pastor if there were any hidden rules if I wanted to keep coming. He said no, and was a man of his word. We attended there 3 years until we moved. We are still friends with everyone even though we don't attend a Baptist church now.
Most churches are run at the local level except for the old line denominations; and most of those are so compromised they wouldn't care about too much. The good ones just want to be good disciples of Jesus, care about others, live in peace and live out their lives as Christians.
What the Watchtower does to members is unlike anything in the NT church, because the WT only applies God's Grace to the leaders. This sets up the two-class system where them and ONLY them are needed for your salvation.
In Christian churches, everyone is a member of the New Covenant, which puts everyone on the same level. The leaders are just servants in the same position as the members.