Beauty of DCA is that this is 100% automated system, so there is no stress involved in trying to time the market.
You do not seem to know the difference between DCA and some DCA tool that has been created by some exchange. Would you like to promote that exchange, too - since you seem to love it's DCA buying tool, so well. By the way, it is not a good idea to DCA into shitcoins, yet exchanges won't stop you from doing that, since they make money no matter what you buy (or trade).
Just for your information (and the information of other members) DCA does not need to be automated in order to qualify as being DCA. DCA can be manual, and it probably is better to do it manually.
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Yes. Even an automated DCA way of buying bitcoin could be supplemented with other buying of BTC, which might also involve additional 1) DCA, 2) lump sum and/or 3) buying dips (that might or might not happen).
It largely depends on the country you are from, but there are places where you can put in place the ideal set-and-forget setup. As far as I know that is mostly in the US though.
Swan Bitcoin and
River offer setups where you can opt for recurring buys, money is automatically pulled from the bank account and then even better, you can set automatic withdrawals to your hardware wallet or any self-custodial address.
I like the possibility to set it up this way for people who really want to have a set-and-forget setup because I would not recommend accumulating a large amount of BTC and leaving it on an exchange. I think too many people with recurring buys in place think that they are all set, but getting it off the exchange is as important if the amount relative to the fees makes DCA purchases followed by instant withdrawals feasible.
But it is still a US thing and some countries in Europe offer it.
One thing to keep in mind is if withdrawals from exchanges are automated to a hardware wallet, you should either define one static address or provide the service with the xPub. Downside of handing out the xPub is that the service knows the whole wallet structure, but the on-chain data is much cleaner as there will be a new address for every automated withdrawal. Imo it makes the accounting cleaner and has advantages later down the road, like proving FIFO or LIFO operations when, for example, it comes to taxation. Having separated spendable UTXOs in different addresses are usually better to begin with once you want to move your coins.