you are only allowing that one thing to get usage access.
what that does is allows an app to read the statistics of your phone, ie. what apps you use, how you use them, how long you use them.
i have a few apps that i allow this, because some apps use this info in how they work.
Basically, the app does something for me, and normally this app has no internet access, so i am not paranoid.
on the other hand, i do not trust any security type apps because they get unusual rights and privleges to work
and it is a big questionmark if they really do work.
out of sheer paranoia and curiosity i will occasionally download and run Sophos, supposedly they have a 100% success rate against all the others- whatever that means.
Get rid of the viruses on your Android device!
security.en.uptodown.com
i find nothing, and after a while i uninstall it again
what are you worried about that you are using Malwarebytes, if you dont mind me asking?