What happens to your crypto when you die?

In tradFi there are rules as to where your money goes when you die and there's no will set out. How about for crypto. Considering crypto is a relatively new craze, it's only really taken off over the last few years and defi has arguably only taken off over the last year or two. They when you die nobody will be able to access your account and hence your money, it will be lost in crypto space forever. How will this effect things.

Will this be a major problem or just a minor issue, over time millions/billions will lost forever on the blockchain.