I'm a casual fan now; I've stopped spending money on idols.
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culture
佛系 originated from Japanese internet culture (仏系) and became hugely popular in China around 2017-2018. It describes a carefree attitude of accepting whatever comes — not competing, not stressing, just going with the flow like a Buddhist monk.
usage
Used as a modifier: 佛系恋爱 (laid-back dating), 佛系养娃 (chill parenting), 佛系减肥 (casual dieting). It precedes almost any activity to mean doing it without caring about the outcome.