Can you explain what the features on this page are being used for? Are you suggesting that if you buy coins from coinbase and they later detect that you are using them to pay for adult content that they will block your account?

Dark net people are pretty confident about tumbling. Or what about just converting coins.

Transferring your coins to a tumbler flags your wallet address in tools like Chainalysis. They can't see where you sent them post-tumble, but they can see that you sent them to a tumbler, and that alone will be flagged on your account.