With wind and solar you also need batteries and those have a very low energy per weight, about 1% of oil, and are also expensive. With hydroelectric, batteries are not necessary.
Discussion
A bit more than 1% but less than 2%, so I won't disagree here.
Hydro is generally more stable, but often produces 'too much' electricity at larger sites. Bitcoin Mining definitely helps here.
Important to note here is that there are almost no periods when you don't produce any electricity at all like with solar or wind.
And Bitcoin mining won't fix that. Ever.
100.000.000 * 0 is still zero.
How many people in the world can own hydro energy generation vs. how many can own solar energy generation?
We are talking energy decentralisation here.
Of course solar or wind are not perfect, but they are the ones that allow more decentralisation.
For electronics that already have batteries and do not use that much, solar is an okay option.
With the cost and low efficiency and batteries, it's not that great of an off-grid option. Perhaps that will improve with better ways to store that energy.