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I'm fine with more than one account, it's the quality of content produced that is critical to me. In this case, it's 100's of accounts for the sole purpose of abusing the 15 SP delegation given for free from Steemit Inc upon account creation.

The Dart network has over 20K accounts that exploited this same loophole.

The question I want to be answered is how do these bulk accounts get approved, but legitimate users struggle to get approved inside of a week. You can see these accounts were approved within minutes of each other.

You can see these accounts were approved within minutes of each other.

Because they signed up within minutes of each other, I guess.
Automated systems, google voice or whatever those farmers are using these days

They got approved within minutes, unknown how they were signed up but very likely is the case.

Where I can read about The Dart Network?

And yes this!

The question I want to be answered is how do these bulk accounts get approved, but legitimate users struggle to get approved inside of a week. You can see these accounts were approved within minutes of each other.

They were made just to spam! Ridiculous how Steemit allowed it.