Bad poker players do this a lot. You bully and bully and bully, everyone folds, and your stack grows. You win little pots because the opponents don't like the risk. You win bigger pots because they think they have a chance, but you throw lots of chips in and act confident. Eventually some situation comes along where you've run up the pot, but there's no way people will fold.

Covid probably looked like just another thing to him in the early days.