We already have this in the Netherlands. In order to deter squatters you can hire a student to live in your property.
You can kick them out on short notice.
Different laws here though. You guys can lose a place to squatting in the Netherlands, we can't here (Canada/Vancouver).
And you should not. Hyping real estate prices or just putting massive real estate to disuse and often pricing the locals out is a big problem but so is losing a property to squatting. Such things don’t always involve millionaires and billionaires.
That would free the apartments the staff would otherwise live in, though?