Trend Micro offers multiple versions of Dr Cleaner. I went to their web site and clicked on the Dr Cleaner Pro link which took me to the MacOS App Store and
Dr Cleaner Pro: System Clean for $14.99. Subsets of Dr Cleaner Pro,
Ie. Dr Cleaner: Disk, Men Clean,
Dr Cleaner Elite - Disk, Memory, System Optimizer are also MacOS Store products and free. If you actually got Dr Cleaner Pro: System Clean free then you got a bargain.
Nothing described in any of the three versions is unique and are available in other applications available from the MacOS App Store and elsewhere. IMO the primary differentiation between apps like Dr Cleaner Pro is more likely to be
"look and feel" rather the functionality as most of what they do is based on MacOS command line (Terminal) Unix commands provided in MacOS. The various apps simply provide a convenient GUI for the command line functions (and MacOS is offering a GUI interface for more and more of the functions offered). I did notice at least one functionality in Dr Cleaner Pro (Securely [
sic] File Shredder) that Apple has withdrawn because it may have a deleterious effect on SSDs.