Bitcoiners use the cheapest energy they can find in place where they can cheaply install hash power.

Some of that may be hydro. A lot is coal.

Even when they do use green energy, the effect of doing that is to displace other users onto dirtier forms of energy, thus creating just as much pollution anyway.

Bitcoin is not green in any way whatsoever. Bitcoin specifically wastes energy, by design. This is never green. The first principle of green energy is to use less energy, as no energy is clean.