Mac Detox Software - is it a good thing?
If you are a Mac user then you will find your computer slowing down just like anyone else's. There is a finite amount of processing power, RAM space and disk throughput that will eventually be maxed-out by the softwares you are running.
The Mac does not have a registry like Windows where the system needs all sorts of details to reference what processes are running and so it is not difficult to remove unwanted start-up programs.
There is a great article on what to do here: https://www.macworld.com/article/2047747/take-control-of-startup-and-login-items.html
Mac detox software - even if it is free - is coming at a cost, whether they are corrupting your browser search results or just recording your activity, you do not need proprietary software to clean a Mac.
We have been seeing a lot of sircles blog spam recently trying to add forwards and links to various Mac clean-up sites and we do not recommend using any. Stick to the trusted sites for information, such as MacWorld and keep your Mac clean of software that may cause more problems than your computer just being slow.