What prompted this topic was the recent news that Stringstorm, a musician mainly known in the Warhammer fandom for making good fan music, was outed as someone who groomed a minor and the dude later admitted it is indeed all true. The timing of this news acted as whiplash to me as the very weekend before the news broke I was just listening to some of his "Warhammer Idol Month" music. Like to start off the topic I will say my favorite of these songs IMO were the Tau songs he did (in particular "Kitty," a song based on Kitten and Shadowsun's past relationship in fellow Warhammer fan parody "If the Emperor Had a Text-to-Speech Device"), but no doubt listening to some of the music will be awkward going forward knowing Stringstorm's history.
Another thing that prompted this topic was a random comment made by YouTube game reviewer GrimBeard and a reference he made to the band "Daughters," an industrial band that was really popular in the scene, but in recent years news has come out that the band's leader was really abusive to his now former girlfriend.
One big personal example for me is the metalcore band "As I Lay Dying." Back in high school during the 00s they were one of my favorite bands in the metalcore scene alongside Killswitch Engage (heck a member of Killswitch Engage even acted as a producer on some of AILD's albums). I won't deny I sometimes still like to listen to AILD's material from the 00s because it is nostalgic, bringing back to my teen years. However it can feel awkward because the band's lead singer, Tim Lambesis, was arrested in the early 2010s for attempting to hire a hitman to murder his wife, which was at least partially linked to the dude also abusing steroids around this time, so despite the wholesome image he put on to the public (AILD even once used to label themselves a "Christian band") the guy was actually an abusive roid rager who wanted to murder his wife instead of simply getting a divorce.
Another huge one is one of my biggest guilty pleasure bands "Blood on the Dancefloor," though more specifically to the band's most consistent member Dahvie Vanity. Former bandmate Jay Vonn admitted on camera during a drag show that Vanity was abusive to him in certain ways, such as not paying Jay Vonn money he was owed, which was especially bad when Jay Vonn got HIV and needed money for his life saving medication but yet Vanity still hoarded the majority of the band's profits for himself. But the biggest problem with Vanity is it's become more well known in recent years he's done some illicit stuff with underage groupies, something which he was accused of in the past but was able to dispute due to lack of evidence, but now evidence against him has piled up to where even Chris Hansen has gotten involved in trying to take him down. I admit I still occasionally listen to some of BOTDF's music from when Jay Vonn was still part of the group, but wish it was someone other than Dahvie Vanity who was singing alongside him.