"What can "charcoal cleansing micellar water" be used for, other than personal use?"?

NOTHING that I’ve found. To be honest, I didn’t find it useful for the things you listed either. So, I suggest that you put the cash that it costs into a savings account & forget the hype!!!

Filling your toilet tank when the water goes out?
Perhaps it is favored by some niche group of restorers who use it to clean gunk out of old things.

You got us: whats the answer? (My money is on industrial solvent)

@LadyMarissa @Smashley I don’t intend to buy it/ use it. I got it in a gift bag. I was about to throw it out.

I bought mind & it was sooo lousy that it ended up in the trash!!!