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If you line it up with that big lake, you can see there's an Air Force base right nearby

https://www.google.com/maps/@29.3385589,-100.8055747,12.72z?...

That's the most curious jamming I see on the map—anybody know why jamming is present there? Is there a military base in that region?

U.S. military has some Very Secret Stuff happening in certain desert areas.

Laughlin air force base is there.

Probably because it's pilot training bases and the maneuvers they perform tend to throw off the ADS-B due to signal issues.

https://www.gpsworld.com/one-gps-mystery-solved-another-rema...

Organized crime in Mexico would probably do it to prevent other people from using migration routes they control and reduce police efficacy. Of course, slightly rogue Mexican police or even US vigilantes also have an incentive.