Just took another look at the process and total CPU usage. Here is the latest:
I checked my other high-CPU processes, and saw that my wife's user account had Safari open and also using a high level of CPU (about 50%). Killed that process, and now RTProtectionDaemon is only using 2-4% CPU, with frequent spikes in the low-40s:
Not sure why RTProtectionDaemon is spiking like that, but at least I found a resolution to the issue and can confirm that it's not (at least not directly) an issue with the Malwarebytes app. Not sure what might my wife might have had open on her account (most likely Yahoo Mail, which has loads of ads constantly circulating), but I'm assuming there was something continuously cycling there that kept the RTProtectionDaemon process constantly scanning.