Lots of these streams don’t show the commercials and instead just have blank airspace when the commercials are airing. But I don’t know if that applies to the superbowl streams though since some people like to watch those commercials.

Just speculating, but maybe it does something like where it checks the image against a CSAM database or something similar, so only images flagged in some government database get blurred.

Edit: or more likely it’s still in the testing stage and has to be enabled either by google or through some obscure setting.