Hi there, long time lurker here.
Just thought I'd share some info too.
Amex plat since Jan 2022. Expressed interest in Dec 2022 spending was around $650k. Spending was 10-20k a month at the start then approximately 50-70k a month consistently with a few outliers. I had no response in that 60-90 day period and assumed I got knocked back. Was intending to express interest again in Jul 2023 with no expectation to see if things changed but they offered it to me just last month which I have accepted. Initiation fee couldn't be waived.
My YTD spending at time of offer was $520k with the most recent statement being almost $200k but according to them, my expression of interest wasn't even looked at until only recently and was based on my initial spending patterns from Jan 22 - Dec 22. My main 'luxury/travel' spending during that period were some watches, jewellery, 4 separate biz class FF point redemptions, a PE booking via Amex travel, some hotel stays booked via FHR or direct with marriot bonvoy/accor, multiple premium concert tickets and a Tesla. One thing to note is that I extensively used the plat benefits - concierge for restaurant bookings, travel credit, dining credit both overseas and local, accor, fhr, hertz, avis, had 4 supp cards with the additional priority pass assigned and other various amex offers. I'm a big sucker for value so I'll definitely miss the Plat. I'll see how things go for the next two years and report back. I suppose that they also restrict the number of active Centurion accounts so give it some time for people to drop out or reject the invites and I'm sure you'll get one soon. All the best!