Then I'll pull it out as cash and they can fight me for it.

If Genesis is found to be operating as a ponzi scheme (lol, lmao), then the bankruptcy court will send you a bill for the money you've withdrawn. You can try to fight that in court - but you'll lose. If you try to fight for it another way, I wish you the best of luck.

Your advice above about maybe not spending recent withdrawals is really good. I just want to point out that recovery of "preferences" (which is what these withdrawals might, possibly, be) doesn't depend on there having been a Ponzi scheme, or any fraud at all, in the underlying business. Identifying and recovering preferential transfers is one of the main jobs of a bankruptcy trustee, and they are given legal superpowers with which to do their jobs.

Cash is fungible. Unless you pull out all your money, they can potentially go after an amount equal to whatever you withdrew…