DCA is going to be quite problematic for any coin or project that is generaly trending downard in its price... One thing about any asset with strong fundamentals would be that even if it is trending downward for very long periods of time, if the fundamentals are strong enough, then the downward trend should end up reversing, and sure it is not guaranteed to reverse, and sometimes we might not know that something is a shitcoin until it never ends up recovering.
Surely there are some shitcoins that end up having second lives, and so there could end up being some value in DCAing into them and then getting out during one of their recovery periods... but yeah, would we call that investing? Probably we would call it trading and/or gambling... depending on how wild the coin is and if there might be some reasons that the coin/project actually has meaningful/substantial value beyond pumping and dumping.
DCA is a strategy that can be used in several investment not just Bitcoin alone.
I want to get something clear here, is it better to DCA in an asset when it is experiencing a high upward trend or DCA when its experiencing a serious downward movement? Because when its going so high, through DCA we are buying at a very high price and we keep buying so high as the price increases, what if it never stops? While when the price is dipping so badly we DCA continuously. Which is more beneficial to an investor with time?