Monero was one of the early alt currencies. Yet none of the core Bitcoin devs have made any effort to make Bitcoin private.  They won't acknowledge fungibility is an issue.  Nostr devs are the same, pushing lightning is making the privacy issue even worse. They are so invested in Bitcoin they won't even talk about the privacy issue yet continue shouting 'freedom tech' every second post.  Its just weird.  None of the other issues with crypto: security, key handing quantum computing are much of a threat to its future than the  fungibility issue . Bitcoin is about to be made utterly useless to the majority of people who operate within the law.  The fungibility issue will see its total and permanent collapse in the next few years. Bitcoin is no threat to CBDCs , it shares its worse property: total control of who can and cannot spend where and when by state or corporate  bad actors.