Its basically an etf u buy using ethereum instead of dollars and on their website or a small exchange instead of NYSE or wherever.
It would have to take something like the G20 or OECD collectively deciding they are all illegal to own transfer or mine. Their market cap would be set back so far. However since powerful entities are investing now, its doubtful that would materialize.
Invictus could pull an exit scam although they would have probably done so in winter 2018 when the value of c20 was nearly 10x the value of all now with much less effort.
They don't invest in tethers which are the most at risk to suddenly collapse. I can easily see half failing in the top 10 or 20 but it would likely happen to most so slowly the rebalancing will reduce exposure.
I think big players in finance are waking up to the idea that bad mouthing legitimate cryptocurrencues is no longer as safe as it used to be.
Thanks for the detailed reply @abitcpoinskeptic!
And it's an open secret that they badmouth it just because they're buying time to produce their own centralized cryptocurrency. E.g. FB