I think bitcoin is decentralized mutual fund, Because everyone can invest their money without any help of others, everyone can do their own sip model investment with their salary.
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From the word itself, mutual is opposed to decentralization which is one of bitcoin's main characteristics. So there is no comparison whatsoever, the business model is very different.
Not really sure why we need to come up with comparisons with others assets. Bitcoin is obviously one of it's kind and it started to revolutionized how we look at the traditional markets, but there is no correlation.