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"to them, Bitcoin would continue to be a side hustle and since the price of cryptocurrency is volatile they could loss the value of their investment at anytime. they also said that they couldn't quit their jobs as that would continue to bring more capital for their investment"
The people that you saw outside did the right thing.
They did the right thing to not quit their job, and take Bitcoin trading as a side hustle only.
TBH, there are only few people out there who have the guts to quit their job, and focus on crypto trading, and become successful. What's worse is there are some traders out there especially when the newbie ones who are getting profit in their first few trades, made a few bucks, quitted their job as they are earning far more than their current day-to-day job, and after that they lose their money in trading. This is the reason why I don't quit my current job as of this moment, and focus more on crypto trading. I know for a fact that yes you can get profit for consecutive days, but there will always be a possibility that one or consecutive wrong trades might end up losing my money.
What is your opinion about this would you quit your job and go into Bitcoin investment, considering it as a full-time hustle?
HELL NO!!!!!!
Unless you're an expert trader who are earning more profits than losses in a monthly basis, why should you quit your day job to just to trade. Why quit your job if you can do both of them at the same time? I'm not an expert in trading, but does expert traders look at the charts 24/7? Bitcoin is very volatile, and very unpredictable thus, you don't know where it can go. One time you might earn profit from it, and then after that you might get lost. Overall, I don't recommend quitting your day job, and focus more in crypto trading.