Why Aren’t Museums Free in Singapore?

I was charged $16 SGD to enter the Singapore Museum the other day. On the timeout website where i learnt that this exhibit was showing, it said it was free. So i was surprised when i found out that it was only free for permanent residents and Singaporeans. This is the second exhibit, the first being Yayoi Kusama, where PR/residents were given free entry or a discounted fare. Now it made me think, why would they limit it to being free for PRs and Singaporeans? Makes sense on face value, you want to give residents the chance to have free...