How did all these new kids discover Old School Metalcore?

I'm a 32 twelvemonth aged boomer and I conscionable got backmost from Hellfest and it was astonishing seeing truthful galore of the caller procreation of hardcore/metalcore kids being STOKED for bands similar Prayer For Cleansing, Zao, Disembodied etc that released albums astir apt mode earlier these kids were adjacent calved and they're adjacent starring the caller question of bands penning euphony successful this benignant and truly embracing the aesthetic and benignant which I deliberation is beauteous but my question is however did they each observe these bands and what was it astir the benignant that drew them into the dependable of 90s/early 2000s metalcore?