It seems most OMAAT readers report success (USA) while some HfP readers report failure (UK)
I do think it is targeted and somehow became public....
1 - this promo link + 10 paid nights = diamond till 2023 : too much luck in keep convincing hotel owners to keep giving free breakfast
2 - normally Diamond threshold is much higher in both Nights/EQP or creditcard spend
important:
3 - i bet IHG while check if newly Diamonds using this promo will use the AMAZON corporate rate to book .....
if not...
If accounts get shut down + losing points due not being eligable ......... i know nothing, me no speak inglish