New versions of ideas should be available to all of us after a certain amount of time.

And I can equally ask why you think others should have the right to control you and stop you from imitating them.

"... To promote the Progress of Science and useful Arts, by securing for limited Times to Authors and Inventors the exclusive Right to their respective Writings and Discoveries."

I don't understand how "person X created this so anyone who does something similar has to pay him and his kin for all eternity" promotes progress. In fact, it does the exact opposite - at some point you can't do or say anything through any persistent media without paying legions of lawyers, trusts, and corporate entities.