That only matters if a significant portion of the userbase actually pays the fee. If only 0.01% of users pay the fee, then advertisers will be totally fine 'onl

That only matters if a significant portion of the userbase actually pays the fee. If only 0.01% of users pay the fee, then advertisers will be totally fine 'only' advertising to the poorest 99.99% of the population. See how people still pay for youtube ads despite there being a premium service to skip them.