Will I incur legal/financial trouble if I use AI generated portraits of nonexistent people for a self-published book cover?

yes, this is called "originality". if the generated image inadvertently resembles a trademarked character or brand, you could face legal challenges. it's essential to ensure that the image does not infringe on any existing trademarks.

>>33242010 (OP)
Nobody is ever going to buy your book, so you're probably safe.