For anyone interested, the Plastc LinkedIn page is still up (though who knows for how much longer).
There is also a FB group started with people discussing a possible class action lawsuit (IANAL so I'm not debating whether such a suit would be valid, I'm just saying someone started a FB page):
https://www.facebook.com/plastccardlawsuit
Also discussion of Amex and Chase, at least, being generous with their time limitations on chargebacks. Offering investigations and refunds for folks going back as far as 2015 in some cases. Of course, there are also anecdotes of other banks/CCs rejecting the chargeback because it's so old.