What it boils down to is that in those situations, you are presented with a choice: (1) don't do X, or (2) do X, and forfeit your relationship with the congregation. And that's fine. I'm not casting judgment on that (in fact, I think it is entirely appropriate). But that IS in fact being disallowed to do something. No, nobody is chaining you down. But to phrase the choice differently, it is, "you are not allowed to choose to do X if you want to remain part of the congregation."
To give another example, I am not going to come to your house and chain you down to stop you from posting porn on this website. You have complete free will to do so if you choose, and nobody has the ability to stop you (unless you announce what you are going to do ahead of time, in which case you would be preemptively banned). But it should be perfectly clear that you are not allowed to do so, because if you do, you will forfeit your membership here. I cannot stop you from exercising your free will to transgress the rules in that regard. But it is clear that there are consequences if you choose to transgress, so you ARE in fact disallowed from posting porn.
Free will and being disallowed from doing something are not mutually exclusive, as you seem to think they are.