Raising a hand is polite on a zoom call. However, it comes in the way of the conversation.
So, we wish to take the liberty and chime in.
But, culturally we are discouraged to contribute by interrupting someone.
A classic problem faced by Indians that pursue higher studies abroad: That of class interaction where you have to compete for a chance to speak.
Instead of focusing on the call, we look for long pauses where we can butt in, make space and rush through our bit. Or, we just wait to be picked.