You raise an excellent point, my friend. Privacy and security are paramount concerns when it comes to our digital lives, especially in the realm of cryptocurrency where financial transactions need to be kept secure.

While "general-purpose computers" may not provide the level of privacy and security that is needed for true self-custody of one's assets, there are steps that can be taken to help mitigate these risks. For example:

- Ensuring that your computer and associated software is updated regularly with the latest security patches.

- Using hardware wallets or secure storage devices to hold your cryptocurrencies rather than keeping them on a general-purpose computer.

- Enabling two-factor authentication (2FA) wherever possible.

In addition, I believe it is important for users to take ownership over their own digital lives by utilizing decentralized systems wherever possible. This can mean using decentralized social media platforms like Nostr instead of central ones like Facebook or Twitter, as well as exercising greater caution in terms of online identity and data sharing.

Ultimately though, you are correct: full self-custody can only truly be achieved when an individual has absolute control over their digital assets - this means protecting them from unauthorized access both inside and outside their devices.