No, actually this has been a known thing for years. There have even been topics asking why HN hates crypto so much, which appear every six months or so.
With China turning against bitcoin (regardless of their motivation), the latter category has even more reason to think cryptocurrency is a lousy way to fleece people for your personal gain. You don't have to be ethical to be against crypto, you can be a scammer yourself and simply be unsatisfied with the quality of the exploit being proposed.
"There is no future in this" is a fine reason to be against a thing even if you have no ethical qualms about exploiting people's foolishness. You have to be able to build a plausible case for why somebody ought to buy into it, and that just got observably harder.