It's true, but how can you blame them? Even "reputable" sources like the official Java updater and many others attempt to install crapware.
I consider myself reasonably savvy and even I get tricked to install crap on windows if I'm not 100% attentive when installing software.
The other day I was setting up a brand new windows machine. I wanted to download chrome so I boot up internet explorer, end up at the bing home page and search for "chrome".
I've just tried again just now, here's what I end up with: https://i.imgur.com/1fTyQXI.png
You'll notice the first ad has a green URL pointing to google.com, seems legit enough right? Wrong, if you click it you end up on some other URL.
I didn't pay attention to that and actually ended up downloading the installer on that webpage, thankfully I realized something was wrong when the actual setup wizard looked weird. I still ran it though, and with administrator privileges, so I'm basically already dead.
This is me, all tech savvy and yet I fucked up with the first thing I attempted to install on a fresh windows.
After that I wanted a PDF reader. Adobe being completely crap I googled for alternatives and found many recommendations for "foxit". I download and install it: it tries to install a bunch of third party "cloud" services and prompts you to subscribe to third party services basically everywhere on the UI. I just wanted a bloody PDF reader... That's the state of "free" software on windows in 2015.
At that point you just can't blame the user, Microsoft should have done something about that issue at least a decade ago.