Somehow? Paying to remove ads is rewarding ads thus causing more ads in the world. It’s not mysterious at all.

There are plenty of ways to not make it an all or nothing service, but that is at least the most straight forward. You could potentially give some of it away and then have to pay for the rest. Or have some stuff for free and more premium content is paid for. Or perhaps based on bandwidth with video quality / resolution.

Anything that is not ads is going to be an improvement.