... invest in the Bitcoin ...
"The Bitcoin"
This made me cackle. Sounds like how a grandmother would refer to Bitcoin if one were to talk about it

I have a feeling that the wide availability of Bitcoin ETFs will herald one of the longest and most stable bull markets for Bitcoin that we have seen to date. I've always invested in BTC using a private wallet but with Fidelity's offering I feel fairly safe and confident putting a portion of my 401k into it. I had to check a few boxes that I accept the risk but other than that Fidelity authorized the transaction.
What's the basis behind the assumption that a stable and long lasting bull market is coming? I'd be very curious to know a bit more about that comment.
People have lost their 401K's in financial products before. Please don't think that just because Fidelity have done this, it doesn't mean you'll ever be able to redeem that bitcoin etf unit for a real one down the line.