Even if it's a publicity stunt, who cares? They're helping people, and what do you think they will get from this? People will praise them for a minute or so and that's all.
If they do it anonymously, people will say they don't care! Others already mentioned celebs like Jennie or Heechul, for example. It doesn't matter what these celebs doing, let be it donations or speaking up about some important topics.
If they do it, people will either hate them or don't. There's no middle ground. Meanwhile, the same people who are whining about celebs and what they do, they probably never helped anyone.
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Anyway, Hwasa also donated!