In reality, practically nobody cares and most employers are more than happy to hire experienced engineers who happened to work at some employers who did sketchy things.
But, if we're going to drill down into the ethics of crypto startups, I think they come out looking pretty good in comparison.
It's worth noting that the author of this post works at Hubspot which literally had an entire book written about how its workplace culture was highly discriminatory, particularly against older workers.("Disrupted: My Misadventure in the Start-Up Bubble ")
Engineers in glass houses....