This App only does Safari for free. If you want it for your other browsers, it costs $9. It does nothing that several actually free Apps do. So what it seems you are really paying for is that it does it automatically instead of having to launch the App.. As previously pointed out, some of the stuff it does most users do not really want it to do. In particular the last thing I want it to remove are my autofill settings. We could be talking your contact info, password and credit card info here. This may be fine for a public computer but on a personal machine, I want that stuff, which often takes significant time to set up, present to speed up use of web sites, remember my passwords for certain one and fill in my address and purchase information when buying stuff.
Not only that, I am of the opinion that such maintenance only needs to be done on an occasional bases, so that launching it manually to do this is fine for me. Additionally many of the other maintenance tools that do this also can clean up your entire system as well. So for me, the routine is that every few weeks I launch such an app, select what I want done, and take a short break while it does its thing. When done, I just reboot my Mac and I am set for several more weeks.