If you had to answer and list one for both questions, literally forced to both think of an answer and post it:
1) of all the reasons a fan can have to abruptly stop watching, supporting, and donating to his oshi, which is the most morally wrong?
2) of all the ways a vtuber could abruptly and one-sidedly change their content or their relationship with their fans, which is most morally wrong?
must not involve any actual crimes