i'd say this looks like it is just unraveling and not suffering from heavy wear. I'd get a needle and
thread (maybe embroidery floss weight) and reinforce it that way if it were mine.
these industrially knit gloves just sort of jump from one part of the glove to the other without the stuff we'd do when we knit by hand (weaving in, for example).
A patch would probably look super cool right there, but you'd want to find a fabric that is pliable
enough to not make it feel bulky when you fold your thumb in.