> But coinbase, isn't it a centralized service that sort of defeats the purpose of crypto/bitcoin which is supposed to be decentralized? Dollar cost average in

> But coinbase, isn't it a centralized service that sort of defeats the purpose of crypto/bitcoin which is supposed to be decentralized? Dollar cost average in, say, every month, on Coinbase, withdraw the BTCs immediately to an address you control (for example using an hardware wallet). Do that 20 times and you never have more than 5% of your cash at once on the centralized exchange. Some call it "on ramp / off ramp". Now I don't doubt some people use Coinbase as their wallet: both for the on/off ramp and to store their coins (that is: without bothering to ever withdraw to an address they control) but nothing forces people to do that.