In context of semantic web, pursuit of the eyeballs is a problem because it makes the people owning/creating the data also want to be delivering that data directly to the users, and be the only ones allowing to do so. Semantic web works for the opposite goal - to allow the data to be automatically transmitted, processed and understood by software, and only perhaps eventually delivered in some form to end user.
As for building more net-positive information ecosystems, going for the eyeballs instead of actually caring to deliver good information isn't necessarily bad per se, just suboptimal. It's better for an eyeball-chasing site to publish some information, if otherwise that information wouldn't be published at all. But it's the eyeballs being your primary revenue source that will make you work hard to make the data as useless as possible outside your own publication - which leads to a very unhealthy information ecosystem.
As for building more net-positive information ecosystems, going for the eyeballs instead of actually caring to deliver good information isn't necessarily bad per se, just suboptimal. It's better for an eyeball-chasing site to publish some information, if otherwise that information wouldn't be published at all. But it's the eyeballs being your primary revenue source that will make you work hard to make the data as useless as possible outside your own publication - which leads to a very unhealthy information ecosystem.