Blue light has a documented effect on our circadian rhythm and melatonin production. It’s been studied quite a bit. I’m sure mental overstimulation is a component, but it absolutely is not the whole story.
In Western society, there is a big focus on silver bullet solutions because people don’t want to address issues in a holistic way. Thus, you have blue light filters instead of turning the screen off.
If OP is attempting a 3-2-1 Backup scheme, this is an irrelevant argument.
OP wants to store a backup in a different physical location while trusting that it won’t be used to train AI. They are looking for services that can satisfy that.