Function for Fire TV Stick doubtful

I have tentatively bought the app, the name is misleading, however: The original is CleanMaster and can do much more.
Master Cleaner Pro can delete files, which also each file manager can (which comes via sideload on the stick). What the app deletes, if you can delete cache and RAM, remains uncertain, as does not appear, what will be deleted. One can therefore also select no apps, where the cache is cleared. For me, the RAM usage after deleting was even slightly higher than before deleting :-)
Overall, my app appears plentiful useless if there come extensions, as promised in the description text, remains to be seen. Then I like to take care of my evaluation.