In RP plate spinning, guys have multiple girls they're having sex with, but there is little or no emotional investment.

With beta orbiters, girls have multiple guys emotionally invested in them, with little to no physical reciprocation.

EDIT: I switched terminology to beta orbiters. Friendzoning implies the female intentionally accepting positive attention from orbiters while realizing it's on the pretense of a possible physical relationship, but I think it is more common that the female doesn't know because beta orbiters often don't ever say anything explicit about their feelings, and many girls see the positive attention as "he's just a sweet guy"

EDIT 2: I should point out that I don't see plate spinning or having beta orbiters as inherently right or wrong, moral or immoral. Some responses are taking this post as some sort of justification for TRP because look they're doing it too. I'm not trying to justify anything. It was just an observation I made and wanted feedback.