I like fresh strawberries on my Cheerios, and I’ve found this to be true.
My boys LOVED strawberries (“strawbies”) as young children, and I often do a fair amount of our grocery shopping, so I have a lot of experience picking strawberry cartons. And no matter what, they’re bland/sour as often as not. There’s a brief period when the US ones are in season when they’re typically pretty good, but the rest of the time, they’re either not in season, or they’re from elsewhere and picked too early.
I find that to be true of grapes too. One bunch is wonderfully sweet, another is inedibly sour. I usually taste one grape before buying a bunch. That’s the only thing that I will eat in a grocery store.
It says each package contains oxygen absorber. Maybe that adds sweetness to it.
Summary
Protects against Godzilla attacks, too.
I’m pretty sure that’s not the case. I spend a lot of time scouring the labels of dried and freeze dried fruit as it is one of the few healthy treats my kids will eat.
A LOT of the regular dried fruit have sugar in them, but it’s in the ingredients (I was gonna post a pic of the label from some dried blueberries we’ve had sitting around for ages, but I guess someone finally ate them 
)
I think it’s just the freeze drying process that means they are much sweeter than regular dried fruit. No idea what the chemical process is that causes it.
I really think it’s very unlikely that there is some special loophole that allows manufacturers to put sugar in freeze dried fruit, and not put it on the ingredients label, but not regular fruit.
I don’t think the OP thinks it’s a loophole. I think he thinks they’re just cheating and hoping not to get caught.