While in gambling you just blindly trust your fortune and you play a bet on something. In gambling you don't know what the output will be but in trading if you're skillfull enough you'll be close to the output.
Yes that it is since they provably rely only on luck to earn especially if they seek for immediate profit with it. But if they seek for more learnings and think about long term with bitcoin then this became an investment which is more ideal for people to think about since they can lessen the risk compare if they rely on something unsure to them.
This is why people which is interested about bitcoin should do a research and they don't skip any important matter that they need go thru since if they can able to asses the risk and know how to handle the market stress brought fuds and any other factor then provably they might change their perspective that bitcoin is risky asset to accumulate or decide to hold for long time. Hoping for luck is bad thinking about it but rather constant acquiring knowledge can help them get more higher chance to gain from bitcoin and that what makes you a real investor not a gambler.