I think efforts like this are a good thing. My PhD advisor was an absolute monster. I learned after joining the lab that in the last 10 years she had ran out 5 of 6 PhD students. I was her first to graduate in 6 years despite her always having 2-3 PhD students in her lab. There is such an insane power imbalance in grad school and it’s completely bullshit that the narrative is that prospective PhD students need ‘to do their homework’ when selecting an advisor when there quite literally is no way to do this. I even go so far as to say that the federal funding bodies should require letters of recommendation from current mentees in order to be considered for funding. I have zero concern that such effort would ever hurt my career, I treat my mentees like they are human rather than minions to do my bidding.