There's a cynical saying among traditional songwriters:

Change a word, get a third.

In other words, they give a song to some established star, who makes trivial changes and then claims partial songwriting credit.

Is that fair? I don't know. Publishing royalties are so massive that you have to expect people to try to get in on them. Robbie Robertson is notorious for claiming all the songwriting credits for The Band's songs. Was that fair? I don't know that, either.