While "The Flash" leaking on Twitter sounds bad, it may be overblown. The video racked up 1.7 million views; if every single one of those people purchased a $15 movie ticket, that means "The Flash" missed out on $25.5 million extra at the box office. Ultimately, that's a drop in the bucket to what the movie needs to make to turn a profit at this point.
It's also worth pointing out that Twitter has lax standards when it comes to what counts as a view. According to Twitter Analytics, a user has to watch a video for at least two seconds with at least 50% of the video player in-view for it to count as a view. That means someone scrolling on their feed and only watching the Warner Bros. logo before scrolling away would count as a view. There's a chance some people watched the movie on Twitter who had no intention of paying for it either way. Maybe some just wanted to see those cameos to determine if they're really all that impressive.
This isn't the first time this has happened. Someone uploaded all of "The Super Mario Bros. Movie" to Twitter earlier in 2023, which received 9 million views before being taken down. The leak obviously didn't hurt that film's prospects, as it grossed well over $1 billion at the box office. "The Flash" just can't catch a break, as it's well on its way to being a meme-worthy bomb on the same level as "Morbius."