Dear Coffee,
Even if fresh fruit was checked, nobody knows what is inside it until it is opened. If there is a worm in your apple, a hashgacha won’t help.
There have been kashrus alerts about unusual infestations; so somebody must be checking.
Most people I know, look at their food before they eat it.
The fruits that are hard to check, are figs and dates.
Oranges are easy to spot. Some might not know that it’s insects.
I don’t think I’m saying a chiddush.