This is an example where people do have a way to pay for TVs (no need for microtransactions, TVs cost hundreds of dollars already!). But the TV makers have decided they can make more money by adding Ads, so why would they not?
This happened with cable TV too. You pay for the TV already, as a subscription even, why do you also get Ads? Because the cable company gets more money.
Can companies live while just charging for their services? absolutely. Will a lot of companies try to add additional revenue flows anyways? Also yes. In theory a company could compete on a 'no ads' platform. In practice, industry after industry realizes that they can just make more money at the turn of a switch. DeFi doesn't fix that. The advertisers are still going to come calling with their checkbooks.
I grant that DeFi does have some potential for micropayments that are hard with traditional finance. That could help make some blogs and small things ad free. But my point is that making payments has not at all stopped ads from invading every other industry. TV ads are not because your purchase had too much finance overhead. The advertisers will still be there, checkbook in hand.