why is everyone so categorically sure about BTC future success (something which I've never seen RE other sorts of assets)?

this is something i haven't heard when discussing other investment products. everyone seems so 100% sure about BTC path to success that you even see youtubers saying that BTC will surely go up without the traditional disclaimer they all use when talking about stocks.

dont get me wrong, i've been studying btc for a while now but i fail to understand why BTC gives some that extra mile of assurance that other assets do not provide. when discussing other assets that extreme optimism would indeed raise a red flag, right?

thanks