My data not in my control. Review on Quora

I started to use this Quora on website. I discovered that my own answers can not be deleted. But can only be hidden from public view. There is a log for answer edits and it is also public when answer is public. Therefore, there is no privacy. Further, once a question is asked by someone would never be deleted and would never be hidden from public view. If a person deletes his or her account the answers will be hidden from public view for forever. Even the person can not access his or her account and answers etc after deleting the account itself. If a person upvotes or downvotes then he will have difficulty to undo or change it as he can not reach everything. There is no list for it. It means once upvotes or downvotes are done. It is impossible to reach them. Downvotes are hidden for more growth of the business. I feel it wrong. I am not okay with it. They just want to keep everything from everyone. There are no rights for the users. Because of users it exists. I do not know what they will gain by keeping everything from everyone.