Now when Expedia is running the wholesale rates from Marriott it's very tricky to find a lower rates on third parties. Before Expedia wholesale the success rate was like 50-80% but today... 5-10% I reckon? Even less?
It seems it's also up the hotel how they sell their rates. Some properties allow other rates than Expedias wholesale and then it can be possible to find something lower and score a Brg. But most hotels don't and then it's basically 100% impossible to find anything lower resulting in all 3rd parties have the exact same rate lol.

To me this is a bit odd to lock rates among 3rd parties. It must surely be more difficult to attract customers from different sources like from travel agencies, non Bonvoys looking for the lowest rate possible etc. But I guess during these times this doesn't matter as long as the expenses from properties are as low as possible and Brg rates are a part of that.
Let's see what will happen in some years when we'll be back to normal with full war between hotel chains and full capacity.