Neither is the 600k FDIC unless it is in 3 different bank accounts earning 0.01%pa. Securities… well you got SIPC protections if the brokerage fails but that ain’t insurance. Insurance is useful sure but insurance also is a cost. Some risks in life are uninsurable.
Seems to be? https://www.gemini.com/legal/user-agreement#section-fdic-ins... (the FDIC section is a subsection of the gemini dollar section). That said if your crypto wallet gets hacked or the lending platform goes under, you'll still lose your money. I'd imagine the FDIC protection is only for if the bank where gemini stored its dollars went under.