This is a very good 20 minute legal discussion on the Suno agreement and copyrights, and why it is murky and still dangerous.
https://www.taxi.com/transmitter/2601/suno-who-owns-your-ai-created-music-now/
My take from all I've read: the key words are ROYALTY FREE. When you use Band in a Box, you have hired and paid the musicians on your software to play your song that you wrote words and music for. When you subscribe to Suno, which I wouldn't consider royalty free, you are paying Suno to cull (I'd say steal) from musicians who created their works and to give it to you.
John