After following this thread here is my take. Putting aside the copyright side of things.
(1) I use chatgpt or something similar to create lyrics from a prompt.
(2) I write lyrics myself with whatever comes to mind without chatgpt.
In either case how would anyone know which was which. Chatgpt would probably give me something slightly better as I am rubbish at lyrics. Will they use AI to analyse the output, would AI be correct in working out which was which?