It’s the same service wearing a different costume. They sometimes install multiple copies of themselves, for example, the Fallout games will install a copy of the game for each language they support with no option to only install the language you want. Attempting to install mods in most games will cause it to reinstall the entire game, preventing the use of mods. Sometimes when you uninstall them, it doesn’t actually delete the files so it continues to use space on your drives until you reformat or use third party programs to remove them.

In my opinion, it’s an absolutely terrible way to install games, even if the value is good.