Imagine in 2 years, Coinbase gets hacked
They hold all the ETF coins
Investors lose 100B+ worth of BTC
No problem, just fork and reverse the txn, just like eTheReUm did and what eth classic is
And while you're at it, build some functionality for special cases to reverse other txns, like North Koreas and Hamas.
And btw, if you're an American public mining company, you are only allowed to mine this new fork.