BONVOY BRILLIANT
I received and accepted a retention offer of 20k Marriott points to keep my Bonvoy Brilliant card open today. AF doesn't hit until April. AMEX can claw points back if I downgrade or close the card within one year. I got this offer using the chat feature. A previous retention offer in December via phone call was for 10k points after $500 in spend, within similar restrictions about downgrading or cancelling the card within on year. I passed on that offer.

PLATINUM
Accepted 50k MR points to keep the card open with no spending requirement in November 2020. I received the offer via phone call with AMEX.

ASPIRE
Accepted a retention offer of 10k Hilton points after spending $500 in three months. I received this offer via phone call to AMEX in November 2020.