I have no special information, but some of these seem targeted at least partially to internal marketing and morale. For instance, I have seen what appear to be employees (probably union members) delivering a lot of these lines.

I would expect it's at least slightly better for morale, recruiting, and retention. I also expect that executives and middle managers move to use these as an opportunity to reinforce corporate values, whatever that means to them.

Good point, yes - the director of the United video (Karim Zariffa) told me that during the shoot the employees were highly invested (they didn’t want to make a mistake on camera) and the whole shoot likely helped boost employee morale.