Earlier quoted context omitted.
gp used "rent seeking" correctly. The concept of "landlords do nothing while collecting passive income, therefore not creating any value but instead are just exploiting that they own the land" would be correctly described as "rent-seeking behavior".
This equally applies to any investment income wouldn't it? Dividend, loan interest would all be classed as "unearned income" by a certain economic theory I won't name that keeps causing people suffering a century later. Don't do that.
From this, we can conclude that there must be some point after an investment is made where continuing to benefit from it transitions to rent-seeking behavior.