I confess I use WhatsApp as a video shrinker.
Whenever I want to send anyone a video or upload a toot with a video I send it first to myself in WhatsApp.
Then click in the thumbnail and download. It's always a lot smaller while retaining pretty much the same quality for a smartphone.
I also see it as a form of torturing the FBI / CIA or whatever other spying agency the other side of the pond shares my data with. 馃拝