Honestly, they should, both Vesper and Magni had very public reasons for quitting, Vesper had his menhera suspensions, Magni had his back injury that was a bit of a mini hiatus, plus it clearly let his mood down enough.
With Selen, we have probably some of the worst PR niji has gotten, a perfectly ok looking cover being pulled at the last second after it was made public, plus tweets from the talent itself giving the blessing for re-ups, only to have the cherry on top of an announced hospital visit that was confirmed via PL, with many rrating the worst possible result (suicide attempt), this coming from a year's worth of issues and mismanagement, from the AR live to Zaion to Mysta/Nina