2021 Milestone Bonus: Earn 10k points every 10 nights: From 1/1/2021-12/31/2021.
2021 Milestone Bonus: Stay 40 nights, earn 30k additional bonus points. From 1/1/2021-12/31/2021.

Offer Terms: https://www.ihg.com/content/us/en/de...ilestone-bonus
Target Recipients: Not disclosed, based on a variety of factors. Currently, some Platinum cardholders and Spire Elites have reported receiving this offer.
Applicable Markets: USA, Singapore confirmed on this forum so far.
Points granted from this promotion are NOT elite qualifying
Reward Nights and Free Nights DO NOT COUNT toward this milestone bonus.
Offer can be combined with other promotions, including the new 2k Every 2 Nights Promotion!

Other notes. In December 2020, some IHG members received the above information on the app, known as 2021 Milestone Bonuses. As of 1/1/2021, recipients were automatically enrolled. As of 1/15/2021 Offer was named 10K Every 10 Nights, with the bonus at 40 Nights increased from 20k to 30k Points.

My own thoughts. I believe they are targeting anyone who shows likelihood of doing 40 nights or an equivalent in spend. After all, the carrot is fattest at 40 nights. Personally I did 32 nights in 2020, which could be a key factor.