Earlier quoted context omitted.
"What role do the businesses that benefit from advertising revenue play" - They want to lure you into buying their products, at times by any means possible. Back in the day when advertisement was word of mouth and perhaps newspaper ads, the playing field included opinions of the people - it fostered increased quality of products because you wouldn't recommend a shit quality product to your friend. In modern society,…
You're still focusing on advertisers (I didn't make this clear enough). Think about the people owning the football stadium, the tv channel, the newspaper (they're likely advertisers themselves, but let's pretend for a moment they aren't).
If you're worried about the well-being of these people or believe their service is a public good that should exist regardless of profitability on the market, you should allocate public funding for them.