Because he is only talking about categories that can contribute to the system. [Scammers] do not. In so far as the system and the diagram is concerned, [scammers] are to be thwarted and their harmful effects mitigated. A lot of the work done in crypto is security which is entirely about thwarting [scammers]. As an example, The original bitcoin paper on double-spending problem is devoted to securing against a particular type of scam.
Speculators fall in a gray area and need to be dealt with on a case-by-case basis. many of them are straight up scams, Some are legit, and the rest are in between. Stratton Oakmont was a scam. Does that mean your index-fund is also one? Or the stock market and financial system as a whole?
The point i was trying to make was that the disillusionment faced by technologists possibly stemmed from a naivety about how the economy works and how people respond to incentives. Speculators are a "feature/bug" of pretty much any financial system. Stocks, real-estate, fiat-currencies, potatoes - The price of everything is being distorted by speculators. Done right, they bring liquidity, financial stability, and wealth creation. Left to their own devices, they cause volatility, inequity and financial destruction. (Crypto is probably more on the latter side on some of those metrics atm). The People looking to build a good crypto solution has to be clear-eyed about how to handle them.
I also wonder if the author has partly himself to blame. From his post, it looks like he worked for the seedier players in the space (because the pay was better) and is angry at the whole space. Its like a developer who worked for Oracle on MySql swearing off the entire open-source community.
edit: >nobody cares about good tech'
True. That's a big part of why you need [token-holders], "Build it and they will come" is more of a hope than a strategy.
Vitalik touched upon this briefly in an other-wise long and wide-reaching essay. I think its a good treatment of the topic that the author is talking about.
He categorizes the ecosystem broadly into 4 cohorts- [token holders] (which includes investors, speculators, etc.), [pragmatic users] (actual end-users who spend crypto to buy stuff), [intellectuals] (who give the vision and ideology), [builders] (of blockchains, apps, etc.) - These 4 groups come together but with different motivations and there is a gap in understanding between them. Indeed, there is even resistance against trying to reach an understanding - one which plays out in the comments section of every crypto-related post on hn. The author of this twitter-post clearly falls under [intellectual, builder] and has been disillusioned by the speculators from [token-holders]. Yet the [token-holders] are a vital component (as are the other groups) as they fund most of the development and adoption. Ultimately these 4 groups have more in common than not. The challenge going forward is to balance the occasionally conflicting needs of all the 4 groups, which includes checking the excesses of each group, while try to achieve a consensus. (Vitalik provides a nice diagram that maps out what that would look like). Crypto is an experiment in economics and economics is a science as well as a social-science. Anyone looking for a good solution must seek to understand and address the psychology of all the actors involved.