Well... size matters. The tip of a wind turbine blade moves much faster (~25m/s, up to 80m/s in the biggest ones) than the tip of a silent computer fan (~5-6m/s, up to ~10m/s in the faster ones). You can make the blades more silent but there's a limit to what you can do when your blades move that fast and are up to 75m long. And any solution that reduces efficiency is probably a no go for manufacturers and operators.
From your links you can see that a 140mm computer fan at 1000RPM is noisier than a 120mm fan at 1200RPM. Even if the motor is quieter at the lower RPM, increasing the blade size is more than able to compensate and make it overall noisier, even with dimples and owl-wing tricks.
And it's not only the decibels that are the issue necessarily but also the frequencies which can propagate quite far and by all accounts are pretty disturbing. That low frequency hum that the blades produce by simply displacing air while they move is not a problem with a computer fan's tiny blades. And turbines come in farms.
From your links you can see that a 140mm computer fan at 1000RPM is noisier than a 120mm fan at 1200RPM. Even if the motor is quieter at the lower RPM, increasing the blade size is more than able to compensate and make it overall noisier, even with dimples and owl-wing tricks.
And it's not only the decibels that are the issue necessarily but also the frequencies which can propagate quite far and by all accounts are pretty disturbing. That low frequency hum that the blades produce by simply displacing air while they move is not a problem with a computer fan's tiny blades. And turbines come in farms.