Back when I was young and motivated about being left wing instead of being old and jaded but still left wing, we called people who lived off other people's work or by profits without effort "rent seeking social parasites"

I like the sound of a "rent seeking social parasite" trap.

As the Mikado says in the eponymous Gilbert & Sullivan opera:

"something humorous, but lingering, with either boiling oil or melted lead."

That was before I became old enough (as I am now) to live off my superannuation and pension, which is also "passive income" but joy of joys, not a side gig. I'm not in denial about where my pension income comes from. It's other people's labour. That's what I'm invested in.