Would make some sense to copyright your content if you are against people starting similar services
In all countries where the Berne Convention standards apply, copyright is automatic, and need not be obtained through official registration with any government office.
:
"In 1989 the United States enacted the Berne Convention Implementation Act, amending the 1976 Copyright Act to conform to most of the provisions of the Berne Convention. As a result,
the use of copyright notices has become optional to claim copyright, because
the Berne Convention makes copyright automatic.[23] However, the lack of notice of copyright using these marks may have consequences in terms of reduced damages in an infringement lawsuit using notices of this form may reduce the likelihood of a defense of "innocent infringement" being successful.[24]"
Also, I'm not against people running similar services at all; I'm against you, because you act like a dick, and I don't consent to you using my work.