It makes all the sense. There is no subscription fee. There is no premise nor expectation of payment by the viewer. They get paid as a consequence of people viewing, ahead of time by sponsors, or as a payment in lieu by ad monetisation - or if lucky/good enough voluntary donations. Keyword voluntary. This expectation of donorship is a recent fad that is just banal and asinine at the same time.

By extension do you feel obliged to buy the products being advertised because they have incurred the expense to buy the ad space and/or sponsorship?