We just got a super helpful tip from a hostel mate who has been in Venice for a bit!
One way they get the tourists is by having cover charges at cafes/restaurants. It can be from €1 to 4 or 5, just for sitting and eating/drinking at their place.
This is what they do instead of tips, but you won’t know what it is until the bill comes out costing more for you to sit there than your actual cappuccino!
Make sure to ask the host before you choose your next cafe!