True, but veggies will have eggs on them at most, which may or may not be able to hatch and infect a cricket, whereas the worms are like minimotels that allow those eggs to hatch, thrive and then fully formed parasites in the worms are eaten by the cham and can thrive in a cham much more readily. Worms are very good at harboring parasites. Parasites have weird life cycles and sometimes need an intermediate host like a worm or snail to be able to infect larger, more advanced hosts. And organic means healthier/safer imo, but also easier for bugs to colonize since there aren't pesticides used...like I said, you can do it if you're aware of the risks and use fecals to monitor the situation. Then at least you'll recognize a problem early hopefully. That's my two cents anyway, fwiw.
Pretty neat that you've had a successful bin for that long!