I heard that there is no tip culture in Italy, but is there a case where tips are attached?

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There is no strict rule about tipping in Italy.
I find this an honest description of our "tip culture"
https://mamalovesitaly.com/tipping-in-italy/

For example if you spend 28 euros in a pizzeria for two people. You can choose to leave 30 euros. You'll say "keep the change". The pizzeria will keep 28 euros and the 2 euros will be divided among the staff.
It is typical to round the number and leave the rest as a "tip"

A few nights ago we ate in a restaurant. 5 person. We paid in equal parts, each one 37.5 euros.
37.5x5=187.5

After fighting with coins we decided to leave 190 euros inside the receipt.
The waiter came and asked us if we wanted the change, we answered "no" and left the place drunker and poorer.

Sometimes there is a "tipping jar" near the cashier.
I would be generous to anyone who touches your food
https://www.facebook.com/BananaFoodGame/photos/...

do bartenders deserve a tip? (YES/NO) .. wtf..
https://www.facebook.com/videomalati/posts/i-ba...

tips to pay for breast surgery to the waitress (genius)
https://www.bastardidentro.it/immagini-e-vignet...