2K patched the launcher for Civ 5 to inject ads for Civ 6, because at the time there was an equal or greater number of Civ 5 players on Steam. Publishers/devs should not be allowed to patch adverts into a game they're no longer actively supporting (the patch caused issues and broke mods).<br><br><br>Thankfully a workaround exists (Google " civ 5 legacy launcher").