AF just hit for my personal Amex Platinum. No retention offers available - they referenced the fact that I received the 100K offer (when the link spread from Reddit) last year.
Just under $5k in spend since I opened the card.
I don't use Delta lounges (AA FF), rarely fly through an airport with a Centurion lounge. I do enjoy the SPG Gold status, but probably not enough to keep the card open. Will mull it over, but likely close the card soon.