The Flash movie is now streaming on Max a little over two months after its theatrical release. The quick turnaround from cinematic release to home viewing is an attempt by the studio to recoup some of the losses from what is widely considered a colossal failure. Conversely, the TV series The Flash was a small screen success, having run for nine seasons on The CW. So, why did the series succeed where the movie did not?
Source:https://www.cbr.com/the-flash-tv-series-success-dceu-movie-failed/