This theme can be further generalized into "money is ruining <insert_whatever>".
"Money is ruining music. Bing Crosby was a true artist; Today's performers like Lady Gaga is a commercial pandering."
"Money is ruining movies. The 1970s had auteur directors but now all we get at theaters is superheroes in spandex and Disney princesses because they need ROI from international blockbusters."
Writers, thinking they have something new to say, like to write on those themes. Readers, with a predisposition to seeing what's wrong with the world, like to read them. I suppose it's some sort of 1st-World ritual of commiseration. Personally, I find those essays devoid of any insight. I can acknowledge that there are undeniable trends there but I try to avoid categorizing them into value judgments of "good vs evil". I understand the economics of why Disney's "Frozen" is the type of film that theaters prefer to show rather than Michael Cimino's "Heaven's Gate".
An example of force-fitting his observations into categories of Hackers-vs-Yuppies (aka good-vs-evil) is his claim:
"I’m going to stake a claim on the word though, and state that the true hacker spirit does not reside at Google, guided by profit targets."
That broad-stroked brush is amateur writing. Google is a big place with ~57,000 employees. Sure, there are probably engineers doing soul-crushing work of parsing logs for server reliability or optimizing ad click conversions. But I'm sure there are other pockets of engineering where "hackers" are innovating and trying to change the world: driverless cars, balloon wifi, etc. It's the same contradictory pockets of bored employees coexisting with passionate hackers in different areas of large companies like Lockheed, AT&T Labs, Apple, etc.
As far as "yuppies" ruining the hackers, I'm not sure who's supposed to be an exemplar of the "hacker" that he wants to run SV. Steve Wozniak & Steve Jobs both came from middle class families. They weren't hobos living out of their cars and overturning the world with their hacker ethos. Apple took money from VC investors within 1 year of its founding. Even Richard Stallman's family background can also be considered "yuppie".