I think it had more to do with the fact that it was complete garbage.
Reposted from
IGN
The Flash director Andy Muschietti has said his DC Extended Universe film failed at the box office because "a lot of people just don’t care about the Flash as a character." bit.ly/4gLko34
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scene craft
Scene Craft
SCENE CRAFT
SCENE! CRAFT!
SCENE!!! CRAFT!!!