DCA is a strategy that works well if you invest gradually with time. It does not prohibit any investor to purchase bitcoin aggressively but when they do like this, is less likely DCA.

Buying agressively and they will run out of invesment capital for purchasing more bitcoin in future, it's not too good application of DCA in investment. If they make some Bitcoin purchases at different times, I agree that it is still DCA practice for their investment. Even so, it's not too good DCA practice as it can affect their average entry price and reduce good effect of DCA on their entry price.