Bearing in mind the implications of disfellowshipping it would be hoped that only people who committed horrendous acts would be treated in this way. However it is not required to commit a gross sin to be disfellowshipped. It is not necessary to discuss doubts with other withnesses to be disfellowshipped. It is not necessary to sin to be disfellowshipped. With brazen conduct being listed as a reason to DF then elders have carte blanche to act in their own interests.
If someone no longer believes and tries to leave, does not discuss doubts with others, does not sin they can still be disfellowshipped merely because they do not believe. Elders will visit to force such a declaration from an individual. I made it clear I believed in God and the ransom sacrifice but I did not believe the GB were god's representatives on Earth because of the lies they printed and the way they misquoted sources. How could a God who hates lies support a GB that lies. I was Df'd for apostacy even though I had not expressed my concerns to any other witness at the hall. In fact if they hadn't come and forced the words out then I still would not have expressed them to witnesses at the hall. That is the madness and cruelty of the process.
If someone stops sinning Elders can still disfellowship them because they sinned in the past and elders do not deem them to be repentant. People have been wrongly Df'd in the past but there is no effort to contact these ones and apologise. How can god be in this process that is open to abuse and is used by individuals to exact vengence.
The decision to disfellowship is often arbitary, elders children as less likely to be Df'd than rank and file, whether you are pursued by elders is also arbitary.
If Jesus did not df Judas despite his bad heart condition and murderous actions then by what right do elders think they have greater authority than Jesus. Jehovah says he will judge in the last days so what makes them think they have the right to express God's judgement ahead of time?
Df'ing is a control mechanism and a way of bullying and threatening the flock. It is cruel and unchristian. If by their fruits you recognise them then this is a rotten fruit from a poisonous tree.