I'd wager the list of folks who: -hold a meaningful enough short position for a potential attack to be worth, say $500k or more (not a rando robinhood trader with a $200 put) -are not an existing bank or long term day trader

is already quite small, and could be quickly prioritized based on how anomalous the trade was, other flags (foreign national, software engineering babckground). I suspect the SEC could get to a workable list of 50 prime suspects reasonably easily.

There are people on /r/wallstreetbets who are blowing up 100k accounts on TSLA puts on Robinhood. On the front page of /r/wsb right now the 3rd highest post is someone who has lost 30k gambling on TSLA.

Even betting 20k would have probably netted you more than what was gained via BTC and you would still be indistinguishable from RH day traders.