Earlier quoted context omitted.
Given that the 8.6% return is contingent on those funds being loaned out to third parties in a manner that involves risk (like margin trading), I am highly skeptical of their ability to not lose your money on the timeline of a decade. The trustworthiness of Blockfi doesn't matter if they mess up and end up loaning money to someone who ends up unable to pay the bill - and the person on the hook if the borrower does no…
Dollar yields in the crypto universe have forever been higher. I've consistently got 12-25% per year from 2015 using exchanges like Bitfinex and haven't lost a single dollar. Why isn't it arbitrated away? Because institutions and market makers don't trust crypto. When they do, I'm sure it'll go as low as rest of market rates.
The other reason is they cut the middle man between a creditor and debtor i.e. banks.
If banks started to sell financial products based on liquidity pools, they had a hard time to compete with places like compound or aave. However, they would set themselves free of the federal fund rate and therefore they could actually provide higher rates to their customers.
So basically, rates would be rising everywhere.