There are plenty of extremely profitable and growing ad-supported digital media businesses. It's just not the Vices and the Buzzfeeds of the world. Spending a ton of money up front to generate a huge volume of largely undifferentiated visitors and then selling their ad impressions at very low CPMs is not a winning strategy. And building it on top of the whims of Facebook's algorithm was worse.
Do you have any examples of those profitable businesses?
Skift is another (and if you've been following digital media for a while you may recognize its founder Rafat Ali)
These are B2B examples. Consumer media is a lot harder because you have to figure out a way to carve out a niche audience that is attractive to advertisers, but I think it's possible. And I think success is a lot more likely if you bootstrap something rather than load up on VC and debt in a moonshot.