I believe I read elsewhere that pay and everything else stayed the same which was the point of the trial. The businesses didn’t expect to like it but were so impressed with the results that they went ahead and kept it. It was an unqualified win for all parties.
AFAICT it really is as good as it sounds like, no gotchas.
So if the argument were about whether a license was important, in the general case, as a selling pointl for books, I would have no choice but to concede.