NYT:
In 2020, catchers set up in the one-knee stance on 23 percent of pitches. Otherwise, they relied on a traditional crouch. This season, catchers have placed a knee in the dirt on 96 percent of pitches.
The setup relieves stress on their knees and quads. It places them in a more athletic position.
It does, however, have a drawback
...
Hedges uses a protective cup that displays an image of a rooster atop a colorful ball pit. The model, fittingly, is called Cock & Balls, from the brand Nutshellz. His teammate, catcher Patrick Bailey, uses a cup called the Nutty Buddy.
Seems like there are no numbers about the frequency of groin shots, but the article is shockingly long, going into great detail on the merits of the new stance and new types of padding players are wearing.