Today the came for cryptocurrency, if we don’t speak up - tomorrow they will come for monads and other category theory goodies.
Honestly, the association with cryptocurrency, blockchain and similar scam technologies has always been one of the biggest stains on the Rust ecosystem, not to mention humanity as a whole. I can completely understand the libs.rs author not wanting to list anything related to that and as a German it is frankly a bit disgusting to use something derived from the Niemöller lines about concentration camps and political persecution to defend cryptocurrencies.
I would also have a hard time going back to the clunky crates.io interface if libs.rs was somehow not available any more or large numbers of authors requested removal of their libraries from there.