Not to defend Bing in anyway, but I typed logitech unifying software and the first result is the download page on logitechs site.
I am not doubting you, but why is it so different for me? I see non of the ??? section, no ads, just a link at the top like you would expect.
What are you using or doing different?
Just tried it in Edge, with no ad block.
The first link was what I was searching for. None of that extra stuff showed up. The ad (for something unrelated) was in a column in the right.
There is no account associated, little browsing history. This machine was completely wiped 2 weeks ago.
I think the difference is, I am not in the US.