Well if you have a monthly bill waiting for you around the corner, there's no reason to hold that money for crypto though obviously. I had seen worse decision by people trying to play blind and loaning instead just to get their hands into crypto then later regretting it when bearish market arrives.
If you have any other priorities related to your needs, I don't see any bad reason to using your money on that first. Not sure why people just don't get their priorities right.
An incorrect assessment of risks can lead to loss of money, so debt and investment should be separated for your own safety. As for spending cryptocurrency in a bear market, I don't think it's a good idea. It doesn’t matter if it’s bitcoin or altcoins, if you bought them for investment, then selling them when the market falls will lead to a potential loss of profit.
There may be different situations, if you have to sell in order to close some kind of debt, then this is acceptable, but I have said more than once that before you start investing, you should resolve all issues with the roads, and only after that start investing. Some unforeseen situations may occur, but for this there must be a cash reserve. You can almost always be prepared for many situations that can protect you from selling your bitcoins in a falling market.