I'll be the carrier pigeon here.. from someone much smarter than me who doesnt appear to have a steemit account....
"You claim miners can create outputs for free - MRL-001 established that it's pointless without owning like 80% of the outputs. We'd realize very quickly if a miner was creating 80% spurious outputs, because the tx growth would be insane, we'd outstrip Bitcoin.
You cant get 80% of the outputs without being glaringly obvious, and if you did so, you cant do it for free without an excessive hashrate
Also, I think the 80% number was assuming a smaller number of ring members than we have now, and definitely a smaller number than we're planning on (10-20)
So even assuming the attacker can get 80% without being noticed is lenient"