YouTube star turned major label pop star turned Mad Decent-signed pop star Poppy recently released a new album, Am I A Girl?, that included a collaboration with Grimes - the part bubblebum, part metal "Play Destroy." Poppy spoke to Billboard about the album, and about working with Grimes, which she said was an experience she "could have gone without."
From Billboard:

"I was kind of bullied into submission by [Grimes] and her team of self-proclaimed feminists," she says. "We planned the song coming out months ago, and she was preventing it. I got to watch her bully songwriters into signing NDA[s] and not taking credit for songs that they were a part of. She doesn't practice what she preaches. It's really upsetting to work with a female that is very outward about a topic, but behind closed doors, it's the complete opposite. It's actually very disheartening to people that are actually feminists and supporters of other females."

Grimes' song with Poppy is one of many notable collaborations she's been involved with this year. She just released "We Appreciate Power," the first single from her still TBA fifth album, which features Hana. Grimes also appeared on songs with Mindless Self Indulgence singer Jimmy Urine and Janelle Monae this year, and she's set to appear on the new Bring Me the Horizon album due out early next year. Then, of course, there's Grimes' most infamous 2018 collaboration of all. No, not her relationship with Tesla co-founder Elon Musk; the song she was supposed to record with Azealia Banks, which, according to Azealia, led to her waiting at Elon Musk's LA house for days waiting to record, and theorizing that Grimes and Elon wanted her there for a threesome (among other rants).