Black Widow
which seriously hurt the film. Everyone knew going in that was the case, so most assumed an origin story (which it kind of was.) it really had very little to offer Phase 4 other than Yelena. So if you read the reviews you would probably give it a miss (if you were a general audience member and not a fan.) So it was an uphill struggle to start with...
Shang Chi was much better advertised, I lost track how many tv spots there were. It was hyped by most critics as one of the best Marvel movies (unlike BW which had average reviews) I really expected it to trounce BW because of its release timing, good reviews and people going to see it more than once.
I wonder if we will ever find out the US numbers for Disney+ buyers. That would solidify how much BW made in all. I know I can dream.