Phew!
I'm glad that United didn't do anything ridiculous.
This means having elite status in SPG, Marriott, and Hyatt, which isn't so bad. The status doesn't always mean much, but if it leads to free internet, great!
My only experience in decades has been the Newark Airport Marriott, which I would prefer to avoid. But I'm sure they have nicer properties elsewhere.
United's crews often stay in Marriott properties (it would be against the rules and unfair to the crews to post any more details.) But this suggests that the two companies have a relationship that runs deeper than just MileagePlus.