On the other hand, it might be worth putting an encrypted private key into at least one safe safe.
Most of my BTC is on hardware wallets and a smaller part on exchanges for trading purposes (probably only around 10% currently) so I feel comfortable with my storing strategy. But I wouldn't mind "diversifying" a small percentual part of my storing into an online third party *IF* it was fully insured... and no custody fee. That's what I meant.