Money happened.
Wherever there's big money to be made, will also attract ambitious people hungry for money and power - it's that simple.
Now that FAANG jobs aren't looking all that attractive, many such people have set their sights on AI research/dev and quant finance jobs. The latter one has exploded in popularity / virality the past years. Previously a niche profession within finance which, frankly, most had no clue existed, has become almost a mainstream ambition. Some of the people that never identified themselves as nerds, will wander from industry to industry, which one that pays the most.
But back to the nerds: Some nerds obviously changed. If you throw generational wealth at most people, they will change. Few people are so disinterested in money that it is simply not a thing they care about.
What's more, many nerds discovered that with enormous amounts of money, comes enormous amounts of power. You can now actually lobby for your sci-fi dream world, which is what some of the billionaire nerds are doing.
The money and power corrupted them.