Security app recomendation and need to be phone administrator

I was having problems with Malwarebytes on Android (kept freezing, even after uninstalling and reinstalling) so I am looking for a new one. The only name I recognized from the Google Play store that did not say that they would feed me ads (or in-app purchases) was Sophos. I am ok with this, but after installing, it keeps telling me that it needs to be the phone adminstrator to prevent being uninstalled.

Is this normal for a security app? I don't recall Malwarebytes continually nagging me for this. I'd like to be able to easily uninstall this app if I ever want to, so I'm not sure why I'd want to make it a phone administrator. Anyways, if this is not a reasonable demand from Sophos, are there any other free antimalware apps that don't have ads or nag me to buy stuff?

Let's block ads! (Why?)

Security app recomendation and need to be phone administrator