It depends on who they hired. The last ... many times an alternative app like this getting killed... they just went out on a whimper because most of it happens outside of youtube and noone knows about these small times talents, they get abused, wasted their times and might even be put in debt and noone knows about. Which is just sad honestly.
The site itself referenced
Iriam, a failed japanese vtuber streaming app with about 98 vtuber listed in vtuber wiki, I checked, out of those 98, 62 has graduated. Most of them have removed iriam from their bio and make no mention of the app whatsoever. I was only able to find 7 people who still has iriam link on their bio or tweeting about streaming on iriam. The rest seems to have moved on from iriam
Some interesting vtubers I found who seems to have moved on from iriam:
Hanasaki Iris designed the infamous 5k subs line stamp art for suisei
Kanade Kanon -> actually get picked up by 774 inc.
Saeki Yahiro, designer of multiple suisei costumes, stages, also did aki MV illustration, pekora/miko costumes
Kanbutsu Himono, 191k subs on youtube, live2d rigger of kson and ayunda risu, no idea why or how she gets this big
Beside Iriam we were talking about another streaming app called "
Reality"
here where most of their vtuber graduated and the company got sold to random music label C.