It'd depend heavily on what the specific circumstances of the FBI's actions were. Creating a coin to investigate pump & dumps is not entrapment. That's a lega

It'd depend heavily on what the specific circumstances of the FBI's actions were. Creating a coin to investigate pump & dumps is not entrapment. That's a legal action, and one that many legit people and businesses do. It's akin to standing up a server on the Internet to see who hacks it. If they approached a market maker who was not otherwise marketing pump & dumps and said "Hey, I have this coin, can you pump it up so I can exit with a profit?" and the market maker replies "This is not normally something we do, we're not interested" and then the FBI keeps approaching them with progressively higher prices until they give in, they'd have a good case for entrapment. If they threaten the market maker's family, it'd be a very good case. But note that even if it's the FBI doing the approaching, but the market maker just says "Sure, here's the price", it's still not entrapment. In that situation they're still clearly willing to commit crimes.