Why does CoinBase only have $320m insurance if they custody like $50 billion?

Was reviewing the Coinbase insurance policy and this one gave me a double take. Says they only cover $320m per-incident and overall. Seems low considering they have to custody what...$50 billion in crypto? Can somebody explain this to me?

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https://preview.redd.it/5d2xneze1ia71.jpg?width=1536&format=pjpg&auto=webp&s=25ebbe3b38c8d63594027e0b253e5a08fe334262

submitted by /u/OwwNowwBrowwnCoww to r/Bitcoin
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Quelle: bitcoin-en