Yes to everything.
Highest IR setting may white wash facees eliminating who it is.
Your cloud storage on Blink servers will fill up very fast.
This is yet another classic example of people buy Blink and then use it in ways it’s not really intended for. That would be a wired system for high traffic area. Blink is dirt cheap and super easy install is the motivation factor. What the end up with is a half ■■■ security solution and frustration in a kind of sorta reliable system.