Taken as a movie that specifically targets teens, this fake "found footage" style drama makes more sense. In a vacuum, When Today Ends isn't a great movie, as it's incredibly heavy-handed and at times overwrought. Further, it doesn't even have a story. The film is a series of selfie livestreams, each showing different day in the life moments of the main characters, most of which involve harassment, assault, hateful language, and bullying behavior. However, viewing this movie as a kind of public service announcement meant to teach teens (and any adult caught up along the way) about the effect and harm hateful language and behavior can and does have, then the movie should be seen and praised. It does showcase some brave and committed acting (if not fully there yet), and it gives plenty of time to family and school scenes of hateful language, harassment, shaming, and assault.
The main problem is that the emotional impact this movie desires and deserves isn't there. This drama cannot be compared to something like Bullied, a terrifying, brutal, and tragic documentary about youth and teen suicide that features lots of actual footage of harassment, assault, and bullying behavior, most of which was shot by other kids filming with their phones. One major difference immediately clear is how much more terrifying and brutal the real-life footage of bullying behavior, harassment, and assault is than anything When Today Ends shows.