i think chaumian blinded signatures have their uses

but i think that as a payment method is shit

they are literally exactly the same as the old silver certificates that Dollars were once upon a time, in wildcat banking days

the risk of them being issued without sats backing them, or the "mint" disappearing without honoring their tokens is very high

the privacy features many tout entirely are dependent on the ethical calibre of the mint operators, and it is very simple to see how they can be paid to deliberately not issue them in a proper way so as to make it possible to track who is using them and where they are spending them

they make good vouchers though, such as gift certificates, but even in this situation they need to be constrained by giving them expiry dates for the protection of the users, to limit the risk of the tokens not being redeemable

they could be a good way to sell uniform quantities of bandwidth, for example, on an internet service or anonymously paid anonymising network along similar lines as Tor, or for buying blocks time for a time based subscription like relay service or music/video streaming