"Boar taint" is a problem with domestic hogs,too. That's why their castrated young if they're to be market hogs.
The earliest explorers brought swine to North America. Some got loose. Now you can "see a real wild hog" throughout much of the South, where there are a pest.
I got the chance in the mid-'80s to work with the Florida DNR and the National Pork Board in studying wild pigs in Florida. The issue was a communicable disease in wild pigs called pseudorabies, or Aujesky's disease. It's a threat to domestic hog raising because wild pigs will approach domestic pigs, especially if it's a female in heat.
Anyway, feral swine are domestic swine that have gone wild. All wild swine in North America are from domestic stock (but not peccaries (javelina)). I am very suspicious of anything called a "Russian wild boar." Some pigs are just hairier than others.
There was a great story out of Texas about 15 years ago where wild swine were coming up out of the gullies at night and biting heifers in the vulva. This made the cows ****, which gave the pigs a hot lunch.
It also gave the cows pseudorabies, which killed them.
The government's response was to hunt the pigs from helicopters with machine guns.
Now THAT is a hunt I'd pay for.