Micellar water is type of cleanser. It contains micelles which are basically soap molecules. Micellar water isn’t a toner, face mask or serum

I keep seeing people on Tik Tok using it in the latter ways

Your toners, serums and masks don’t contain soap. They’re not meant to cleanse. Using micellar water as a serum is like not washing your cleanser off and calling that a serum.