Yeah, they'll still do it so you minus well monetize everything on your channel. It takes a while for YouTube to demonetize your channel so just make all of the money off of it that you can.
I would also consider separating your original content from your reused content. Put your original content on a separate channel so that you never have to worry about getting demonetized on that one.
Put all of your reused content on a different one and what I usually do is I buy a monetized channel so that it's already monetized and I make the money from the reused content on that one until the day YouTube demonetizes it.