It isn't week will. It is a lack of confidence. Kids are socially aware. Group dynamics are more important than grades. They don't like doing anything on their own because that risks doing something that might not be socially acceptable. Studying with a partner means constant validation that studying is a worthwhile activity. It is like a young dog that will not settle until it sees another dog do so first. So it isn't lack of will rather the very modern need to comport with social norms that drives people to stream someone studying. It validates their decision to study too.

Think of echo chambers/bubbles in politics. People think one thing, then find other people online who think the same. Finding other people saying the same things then reinforces their beliefs. So someone wanting to spend a few hours studying finds someone online doing the same, reinforcing their choice to study.