Yes, perhaps during the installation process one of the "checked" items might be to install something like the Ask Toolbar.
Fortunately, for most any freeware programs or utility I ever decide to install, I always carefully choose the "custom install" (if it has that option), and on each step before clicking "Next" see what options it shows or what it's trying to install, and if it has some item checked, such as a Toolbar or some extra I didn't want, I'm sure to Un-Check that particular item.
I guess that's how most freeware can be freeware, is because often times they have it bundled with some toolbar or some other fairly useless or intrusive app you don't want (in which they probably get a commission of sales from doing it that way), and they're probably counting on that a lot of Users with just click "Next, Next, Next" without reading the options or what it's installing.
Plus a lot of free utilities have some "Pro Version" they try to sell you too that may have a few extra features. But yeah, I still recommend Glary Utilities, I find it's a great little utility with lots of nice features and what it can do. But of course it's up to each User to be careful about the installation process of any program they install (especially any free ones).
Of course, if you do accidentally install something like an Ask toolbar, you should be able to remove it from your Window Control Panels Add/Remove Programs list.
Cheers! :)