just cuz the dates are close doesn't mean they were ripped off, but they possibly could. U never no, though. dc and marvel could've had a secret plan to make a bunch of the same types of characters for competition. besides, dates of offially coming out mean nothing. Marvel could've obviously made their characters first, then dc ripped them off, rushed the comics and released theirs 1st to make it look like marvel was doing the ripping off. That's y most dc origin stories tend to not be as good, because they were rushed.
Flash: 1940. Quicksilver: 1964.
Batman: 1939. Moon Knight: 1975.
Deathstroke: 1980. Deadpool: 1991.
Dr. Fate: 1940. Dr. Strange: 1963.
DC Scarecrow: 1941 Marvel Scarecrow: 1964.
Darkseid: 1970. Thanos: 1973.