Why "downvote" was given in my post.

At first I knew serey platform is a polite and kind platform.However, there are some people in this platform who are ruining its environment.New and small users like us are being forced to quit.If someone is harmed for no reason then why or why not work there.Yesterday I made a post on football.There I checked everything.I went to the free copyright checker website and checked the copyright. 

My writing was 100% unique.But my writing suddenly hit the "downvote".I do not understand what caused me to die down vote?

However, the rules and regulations of the serey platform have changed?Can anyone who has the power "kill the downvote"?Or they will see the big users and give them priority.You hate him for using this platform like this.He should not have died in such a way without any reason.I want him to pick up my "downvote"