I think this also describes those working on software in general. Everyone uses the same interesting-to-hackers low level parts of the stack. But the nature of software is that _use_ scales infinitely, so roughly the same small quantity of developers are needed the same as was needed in the 90s.

But technology use has exploded, so there's huge demand for developers working higher up in the stack, because the need for domain specific apps has exploded and that part doesn't scale. So the 90s hackers continue but are now dwarfed by app developers and web developers are many orders of magnitude more numerous.

Unfortunately because software is a commodity the use of the low level parts of the stack doesn't translate to money for the hackers working on them. Because just as it's a niche interest for developers in that area, so it's a niche business case to make money out of working in that area.