This change show a deliberate move for this, fixing a previous buggy implementation instead of removing the behavior.
I find this very unfortunate change. The ratings are very prone to false positives and ambiguity as is (pics for this model and this model are PG or PG-13 after an appeal, but always hit R initially, and their dataset would as well). Besides making it less viable to continue my most my most popular series (either for new bases or when I finally find a name manufacturers are consistent enough on to make a dataset) I've always been an advocate for including a woman's unmentionables and swim clothes when an official design exists (even if its only a single image) so the training has a better understanding of her body shape. That's going to make for a dramatic drop in LoRA quality for newcomers since it seems a single image spoils the batch and force a full payment in yellow.
Edit: Still seems possible to train with blue on main site, so get your training in.