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Sometimes they just leave.
The closest I had to a oshi graduated in less than a year. Was great at singing and playing the guitar got monetized quickly and had a steady following of viewers. Even had more features for her live2d added on each milestone. Was the first time I subscribed to a fanbox and superchat.
She eventually graduated and my selective memory doesn't recall her ever giving a reason but I did notice that she didn't interact as much with her listeners, especially repeat EoP offenders(got a shitty raid from EOoPs spouting memes on an Animal Crossing stream once and a few sticked around to have her say difficult words or memes).
For additional context, she had 2 other "brothers" with the same designer and a sister who was freshly debuted a month or so before her graduation. First brother went on to be more successful and won a spot at an online singing competition while the other faded out first due to lack of consistency in streaming. The entire family seemed to just break up/dissolve after. I didn't check if the remaining members kept their collab videos up but depending on the situation, it might be better to just remove them to avoid viewers from asking questions.
You can never know when they'll leave even as they keep increasing in popularity and profitability they might just simply be gone. Some overnight, some with a proper send off.
