Copyright in footer

Does anyone know much about the theme footer copyright text? I need to know why a theme reviewer would ask me to remove the copyright and replace it with “Powered by WordPress” instead.

I have had copyright with dynamic date in every theme I ever built. Not sure why this is even important to me but I just want a public opinion before I make the change to the theme.

I can make a customizer field but I have never had to do this in the past. And there is nothing wrong with the syntax or code (uses date_i18n, esc_ etc).

The page I need help with: [log in to see the link]