I've been throwing around the term "neo-feudalism" and people seem to get the gist of what I mean intuitively (paying dues to the monopolistic ownership class,

I've been throwing around the term "neo-feudalism" and people seem to get the gist of what I mean intuitively (paying dues to the monopolistic ownership class, only now you're working digital land) but your suggestion of "rentier capitalism" does ultimately fit much better.