Yeah, there’s a few things that stand out.

Qbit was launched just a few months ago, has strong backing.

Some of chain in Recovered Datasets are actually still running, they just have so little hash behind them that they contribute very little. At some point I will elevate them to their true status as Live Sources, but it’s not a priority. Terracoin is an example of this, seems to be only mined by Mining Dutch, who land a block every few months.

These chains have downtime, have been hacked etc. Elastos was down for days a few months ago.