I've bought most of my crypto with a credit card but only to get the 1.5% cash back and pay the complete balance every month. 36 months with zero interests gives you some wiggle room but I wouldn't recommend it because calling tops and bottoms is very difficult. I'd say get rid of debt as soon as you can and only use credit cards to get the cash back and beat those blood sucking credit card companies for once.
Still, you are doing much better that some other people that did buy crypto and are paying the interest right now in the middle of winter.
I will definitely be paying them off as soon as the cryptos get back to ATH ranges. That will probably happen within 2-6 months. If not, then 36months is plenty of time to get it paid down.