Microsoft announced they were building the US East 3 data center in 2021. Then there were no more updates. It still does not exist.
I remember when COVID first started there were capacity issues. Apparently there is now plenty of capacity.
I work on a site where 3 data centers have been completed and another will be turned over by end of this year. There are 4 other sites in construction and 2 additional sites on hold due to power demand.