If it's just link aggregation, you can do it yourself. It's difficult, but possible.

When I was doing newslily (which isn't entirely abandoned, but we've moved on to new projects), we pretty consistently had better quality links than reddit or digg, but doing so took a ton of work on the part of my co-founder and I.

I haven't signed up for OP's service, so I can't say with certainty that it's a link aggregator, but that's what it sounds like. If it is, I suspect that OP is spending a lot of their time searching out quality content.

And if this is the case, good on them. They're probably learning a ton in the process.