Strongly depends on how it's sourced. Would definitely give it a try if it's excess from a milk bank that's about to expire or if it comes from cultured human breast tissue in a lab. Would not try if it its from some random person or otherwise unclear origin though.
Also wouldn't make a habit of it, there's probably infants who would benefit from me not making it more scarce and expensive than it could be.
No, I'd be worried about viruses. With common animal milks, I know there's almost zero chance any viruses present in the milk are capable of infecting a human. Obviously that isn't the case with human milk.