Can an idea get a lot of value via a patent or held as a trade secret?
Uh, let's see: From Bell Labs, the transistor.
They saw that it was so valuable they deliberately didn't patent it and, instead, gave it to the world for free -- that's in effect what they did, but there may be legal details, and I'm not a lawyer.
Suppose that now we had to pay a penny a transistor ......?
Uh, the laser? Not just one that fills a large airplane and is powerful enough to shoot down a missile but the ones the size of a grain of rice and light the long-haul optical fibers for the backbone of the Internet?
How 'bout the amplifiers on the optical fibers?
I'm not a lawyer, but how 'bout RSA encryption?
And the FFT (fast Fourier transform)?
And mRNA for creating vaccines? I know; I know; some people see the mRNA for Covid as naughty, bad, ugly, ...?
Well, there were the Phase III trials, randomized, placebo controlled, double blind, reported in
"Efficacy and Safety of the mRNA-1273 SARS-CoV-2 Vaccine", New England Journal of Medicine, February 4, 2021, 384:403-416
at
https://www.nejm.org/doi/full/10.1056/nejmoa2035389
with efficacy 94% and safety 100% -- uh, for just how the efficacy arithmetic is done might want to check the paper.
Yes, the safety was from ~16,000 persons, and with 1 billion persons maybe safety will be lower than 100%.
There are various error correcting codes, maybe some buried in hardware devices.
It does appear that James Simons had some ideas that are valuable and not easy for others to copy.