Five members of the Supreme Court recluse themselves from a case because of (checks notes) it would involve impacting their side hustle of writing books
first, it's "recuse", not "recluse"
second, you've got it backwards: it's not that the case will affect their (future) book-writing, it's their (past) book-writing might affect the case. 5 justices have previously received money from the publisher, so the concern is that they won't be impartial. newsflash: that's good justice (but a bad headline/social media post/outrage generator/bumper sticker).