> A Meta engineer involved in the torrenting wrote a script to prevent seeding, but apparently not leeching.

Wrong. Michael Clark testified under oath that they tried to minimize seeding and not that they prevented it entirely. His words were: "Bashlykov modified the config setting so that the smallest amount of seeding possible could occur" (https://storage.courtlistener.com/recap/gov.uscourts.cand.41...)

They could have used or written a client that was incapable of seeding but they didn't.

> no if you had leeched its is very unlikely that you would face time in prison.

Not the one who claimed that, but if I think it's fair to say that doing what they did, at that scale, could easily result in me (and most people) being bankrupted by fines and/or legal expenses.