There is also another principle that will be just as important once broader Bitcoin adoption — or scrutiny — takes hold. And that is Bitcoin privacy.
One of the best and most entrepreneurial ways of growing a private stack not tied to any KYC exchange is to maintain or offer a service that can receive Bitcoin as payment, or you just receive BTC as reimbursement of some kind.
Once Bitcoiners began earning and spending in Bitcoin en masse, the deterministic links so heavily tracked by governments and larger institutions will prove impossible. You can start to make that happen.
Unlike the custodial Bitcoin mixers of yesterday (I’m looking at you, dark net market customers), coinjoins noncustodially obfuscate the trail of Satoshis by randomly batching transactions, giving each participant forward-looking privacy on their Bitcoin.
These are peer-to-peer exchanges where you use ordinary payment methods (SEPA bank transfers, Venmo, Revolut, Cash App, Interac, etc.) to send money to private people and they send you Bitcoin. That's what God intended.
The two I would recommend for on-chain Bitcoin transactions would be Bisq and Hodl Hodl.
A new service that launched some months ago is Robosats, a simple and private lightning exchange that should only be accessed via the Tor browser.
The most obvious way of ensuring Bitcoin privacy is to use the Layer 2 Bitcoin solution of the Lightning network.
The advantage of this method is that your privacy is nearly guaranteed once your funds are on the lightning network.