What happen if is no copyright?

Answer 1

In the United States, anyone found to have infringed a copyrighted work may be liable for statutory damages up to $30,000 for each work infringed and, if willful infringement is proven by the copyright owner, that amount may be increased up to $150,000 for each work infringed. In addition, an infringer of a work may also be liable for the attorney's fees incurred by the copyright owner to enforce his or her rights

Answer 2

If a copyright has expired (public domain) then the work is free for anyone to use without restriction. If, however, there is simply no copyright notice in evidence this does not mean that the work is not protected. Existing copyright law in the US was amended in 1989 so a copyright notice is no longer required.

Answer 3

It varies slightly from country to country. In the US, statutory fines range from $750 to $30,000, but can be as high as $250,000 and five years in prison.

From another perspective, you're disrespecting the creator of the work, devaluing their intellectual property, and removing incentive for them to create new works.

Answer 4

People could easily copy, take your ideas and sell them as if that were their own.