smart users can easily find/ignore bad actors - agency relays 
dumb users need / will stick to default as always.
no need historic perf. - similar WoT or bitcoinmint rating or trust model.  nostrudel has RELAY REVIEW section before.
what if SWAT team comes pull gun on RELAYADMIN HEAD ask him handover all realy log n record ? History of relay doesnot mean it will remain same relay forever