Hardly anything wrong with the set-up except for the size of it:
a bit overcrowded if you ask me with 6 toads in it.
I know. Only 4 of them lived in it, the little toad lived in an extra vivarium because they sometimes confused her with food. And one of the girls was bought only some weeks before the dormancy (of course I asked the pet shop clerk if she would be fed well enough, and was ready to let her live in the tank by herself if she for some reason seemed sickly).

Now all of them live in a giant tank (130 cm * 45 cm * 40 cm), but this wasn't the question, was it?

I'd love to read <shocking stories of toads dying painfully of that>, please let me know where i can find them.
If you're fluent in German I can look if I find them again. And I do not want to harm my pets with not giving them earthworms - I am just scared for their health. If I thought it was safe I would gladly run around collecting worms. That might good for my health, too. ^^

toads don't "play", are never "bored", don't "fall in love", they don't like nor recognize you etc
I think you give them to little credit. They definitively do recognize the spoon I feed them with. And I think they do recognize hands, too. For some of them it might be just a warm spot to relax, but the ones I had to shoo away when they wanted to eat the small toad seem to fear hands, too.

And how can you possible tell their not bored? There are so many psychological animal illnesses known (ever saw a lion running in circles in a zoo? it's one of them), how do you know a toad is not able to feel boredom?

I spent some time watching them, and they do behave differently when put in a new habitat. So they remember to some degree what their surroundings look like. The easyly scared ones will immediately try to hide, the extroverted will explore everything.