There is no house edge in bitcoin investment so where would the barrier to cause us loose come from if at all we don't panic to sell out of Fomo or emergency needs? Maybe I am missing out here.
Investment in general is not without any risk; the risk might vary based on which type of investment, but saying investment is without risk is not right at all, even as you try to point it to Bitcoin investment, which was not included in the OP.
Investing in Bitcoin also comes with risk, and the risk includes, but is not limited to, short-term investors who invest and want to get quick profit, and the market might be dropping at the time which they might want to sell, and the risk of not being able to secure your wallet and ending up losing everything to either scammers or it getting stocked.