I still love XFX! Way back in 2010 a 6850 with their then "double lifetime" warranty was a no brainer. Mining actual bitcoin, dominating the island of Panau, suicide overclocks to 1012MHz from a stock 775MHz...those were the good old days for the little guy.
Fast forward 10 years and the market has changed radically. Double lifetime warranties like XFX's are long gone. Mining crypto became a convenient foil for manufacturers to justify ridiculous GPU prices. AAA games are graphics intensive because they can be, but the gameplay isn't any more compelling. Any hidden overclocking potential has been taken off the table and/or priced accordingly.
Kudos for taking a look at these RX580s. I suspect there's still a market for a serious GPU that costs less than a console and offers a bit of "future proofing" (always in quotes, I know. ) I'm fairly skeptical about buying a used AMD card because of the potential of it having run 24/7 in a poorly maintained crypto mining rig, even though the aforementioned 6850 mined actual bitcoin in 2010 and is still running great!