So the original point of the thread was that this relationship could be considered exploitive. She could be considered vulnerable, to my understanding she has self-esteem issues in particular with regard to body image. He on the other hand benefits from male privilege. The relationship does also violate the informal "half your age plus 7" rule so there's that. I can't help thinking that there are people who would disapprove of such a relationship if it involved personal acquaintances but believe there should be a different standard for judging celebrities. In fact, it seems many celebrities get into unhealthy relationships (perhaps for the entertainment value).
It would seem the age difference has been a topic of public discussion:
https://www.newsweek.com/billie-eilish-jesse-rutherford-age-gap-slammed-amid-romance-reports-1753474
It may be a bigger than usual deal in this case because Ms. Eilish has a reputation as an "influencer" insofar as her female contemporaries might either be inspired to emulate her or perhaps use her as a way to justify their own behavior. Generation Z seem to do more virtue signaling than Millennials which makes this stand out.
As for age gaps, from what I've observed I have the impression that when a man becomes committed to a woman substantially older than himself, he is probably somewhat regretful of that decision. Perhaps Macron is an exception, but without having done a formal study I can say I've seen a lot of evidence of such regret. My mother was almost 9 years older than my father and there were undeniably strains, in fact my father did indeed cheat on her once that I know of. At age 70, I am married to a 65-year-old and at the same age my father was married to a 78-soon-to-turn-79-year-old and I'm glad to not be in that position. Understand that I'm not trying to present a rationale for feeling that way but nevertheless I do. On the other hand, I avoided getting involved with somebody too much younger. When I was 28 or 29 I did get involved with somebody 6.5 years younger (this began with her as the pursuer) and age difference did sometimes come up, although in that case she was struggling with a disconnect between her physical attraction to me vs. shortcomings she saw in me as a partner in a committed relationship, so she may have just raised that issue as one talking point in her internal argument against continuing the relationship. When I met my wife, I guessed her age at 3 years younger than she actually was. I was relieved to learn she wasn't quite so young. She and I share life experiences much more than not.
OTOH I do think that today's society is more open-minded about age gaps in which the man is younger, and also more open-minded about age gaps in same-sex relationships, which has a bearing on how I made up the poll. Even though so far nobody had voted for an option that reflects "disapproval" at least the poll got a lot of votes which should be good for the continued health of this subforum.