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Structure, immune system, and circulatory system are elements of an ecosystem. There are other parts.
A non-extractive #SocialEcosystem is powered by #attention, #labor, and #currency.
The roles of #FreeLoaders and #Suckers in an ecosystem play a part in a sustainable ecosystem. I don't want to be a Sucker. I'm way out of date to be able to provide labor. Don't need to #monetize my attention. Trying to figure out how much currency helps enough but doesn't make me a sucker such that if I leave too much of a currency hole is left, weakening the ecosystem. This same analysis has to be happening with those whose major contribution to powering the ecosystem is their uncompensated labor.
#Microbiology research is exploring how microbial ecosystems operate. The language they use includes FreeLoader and Sucker. Nothing derogatory intended. Open to alternative names for agents who take advantage of others' generosity without giving anything in return.