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Did they offer an unregulated security where there is a chance to lose principle to unsophisticated retail investor which is well known to be illegal? The answer to that is yes.
"Digital currency is not legal tender, is not backed by the government, and crypto accounts held with BlockFi are not subject to FDIC or SIPC protections. Digital currency values are not static and fluctuate due to market changes."
What I think has never been clear is how they were able to manage the risk of their lending practices, in order to provide the big APYs.