Well yes, if the author didn't think cryptocurrencies were a problem, then he probably wouldn't be bothered by crypto currencies influencing the community. There are always going to be large organizations influencing Haskell, like the UK government and Microsoft in the past. I'm guessing this blog post is aimed at people who work with Haskell and know about the crypto companies in the community, but see them like any other organization that funds open source development.

I agree it would be great to have more details about how big this influence is and how it manifests itself.