Adam is clearly *aware* of Ali’s books—Daisy’s husband is playing the love interest in the movie! But I think they both decided there was more to gain from having a dedicated fanbase support them, especially after the mixed reception of the sequel trilogy.
And also, those characters and the Star Wars IP aren’t their creations. For OFMD, it’s a much smaller show with a much more hands-on and personally-invested creative team. It was a passion project, and I’d be pissed if someone took it for their own profit.