In the short term, flexible power production like coal generation gets used to satisfy grid demand during situations with abnormally high power requirements. It has the benefit of being able to be turned on and off practically instantly. There is no economic incentive to build out sustainable generative capacity if it won't be running all the time, and balancing the load on renewable power is awkward (see power price rate inversions for examples of utilities paying people to use excess energy).
I remain unconvinced that cryptocurrency is long term detrimental to clean power generation infrastructure. Quite the contrary, the existence of cryptocurrency to mine acts as a 'productive' sink for power produced in excess of grid baselines. In practice, our entire grid could be renewables in excess of peak demand, and cryptocurrency mining a flexible network load. It could quite possibly get us off of non-clean energy entirely.
> What about the crops they destroy because they would be less profitable?
To clarify this point specifically, food self sufficiency is considered a national security issue.
Consider the situation where a hostile country floods your market with cheap food products (below cost) until your country's farms go bankrupt due to an inability to compete. Once you stop producing food of your own, you give significant power to whoever controls your food supply.
This is a large part of why agricultural subsidies exist. And yes, sometimes it means paying farmers to let crops rot on the vine in order to not cause market gluts. That is an entirely different situation from futures and hedging, which in any sane market match supply and demand (with the result of minimizing waste).
For moderators, the switch from being able to use third party clients to being forced to use the official reddit client would be like a programmer being told their favorite IDE/text editor can no longer be used for code, and you'll have to get used to notepad or something.
Existing code? Fine! No problems, you can run it like normal. Writing new code? I'm not so sure you will have nearly as many developers willing to work in that ecosystem. Third party applications are part of the core moderation loop of pretty much every subreddit that operates at scale, and depriving those moderators of the tools they use will be to the detriment of the quality of the site.
People saying this won't change much probably haven't tried to moderate at scale using only first party tools. It sucks.