but if someone keeps investing in crypto, then it is possible to meet that need by selling some amount from that investment money at the time of special need. Especially since I needed a lot of money a few days ago but there was no money anywhere except crypto funds.
You should try as much as possible to not need to sell your investment to meet your needs. Investing meaus taking money you do not necessarily need at the time and keeping that in as asset which you expect to appreciate in value over time. If you sell intermittently before the projected timeframe you do not get the projected ROI.
Emergencies do come up and our first savings might not be enough to cover that, but do not invest in any asset as a support for rainy days.