I think some devs are fed up of Complexity and excessive abstractions.
C has very few language features, it's a very simple language -- while all modern languages have new (complex and taxing) features.
It's kinda like a Minimalist movement, can we do the same Modern Mumbo Jumbo but in a simple, minimalistic C way?
GC and RAII? Nah, just use Arenas/Pools. Or don't use heap at all.
C is an unsafe language but modern tools get better and better every year, with GCC doing really cool static analysis and finding buffer overflows at compile time.
Also, C runs anywhere and everywhere.