Once a FD manager at the former Renaissance Karlsruhe told me how BRG kills their earnings and some things about OTA likes booking.com (and how much he hates them) - I got a low BRG rate and he asked where I found the rate so I randomly said booking.com:

He said that when an OTA charged a lower price, a BRG claim will bring the room rate down by 25%, so they lose 25% than what they are supposed to earn. Then he said Marriott charges a percentage (can't remember how much) of a booking so they are not earning much at the end of the day on a 60 EUR booking.

Then he moved on to talk about OTAs - he said these horrible companies charge hotels a big commission (again can't remember the exact % but it more than Marriott).

Hotels love and hate OTAs - that guy admits that OTAs helped promoting their hotel (I asked if the hotel is so fed up with them why sells through them). I guess they got fed up being controlled tightly by Marriott so they changed flag.