Rules chnage according to location. There was a time when Rutherford experimented onm Germany, before he implemented any chnages in America. William Schnell stated that he was instrumental in making organizational and theoligical chnages in Germany, and when he came to the USA, he found it was at least 6 months behind in "new light."
That being said, I remember a time when they would announce your name in the circuit and district you were in. If it was a DFing, they told you what it was "This is to inform the congregation that Minimus has been disfellowshipped from the cowchip congregation for picking his nose". If you DA'd yourself, They would actually read youer letter to the congregation or inform them why you DA'd yourself "This is to inform th congregation that Minimus had disassociated himself from the toejam congregation because he likes to waerr women's underwear."
They eventually did away with that, now they just have a talk on the "needs of the congregation shortly after someone gets DF'd, making it easy to know why. When the P.O. Goes before the congregation and gives a talk about fornication or adultery., you know why teh person got DF'd.
As was mentioned before, if you're a well known person, they'll notify everyone and their mothers about it! Not to mention all the gossip.
RR