this is what a QUASAR looks like in Bitcoin: https://bitco…

Any idea what "unrecognized" is, and why it's such a high percentage?

Yes, "unrecognized" is for transactions that contain some OP_RETURN data but not from a protocol the website has in its list (which only contains weathersv & twetch at the moment it seems)
high % because most are from Satoshi's Shotgun (a tx generator)