Bitcoin is vehemently anti-communist because:

1. It encourages savings, which leads to more capital accumulation, more people getting rich by delayed consumption and lowering time preference

2. Despite a bitcoin costing a certain amount to mine, its price is always determined by the subjective valuations of buyers and sellers, hence going against the labour theory of value

3. It makes seizure extremely costly, and hence it is private property that cannot be seized without going through great pain and expenditure in time and resources, the former of which communists have a lot of due to being jobless and lazy in life and the latter of which they have little of due to being poor

4. Due to (3), it incentivizes voluntary and mutually beneficial exchange, which leads to a greater proliferation of the contractual means of acquiring wealth, which means more private property and more privately owned means of production.

5. It is anti-revolutionary. The likelihood of a Bitcoiner violently damaging or seizing anyone's physical private property is very low because they can simply buy it by mutual consent owing to the fact that they are rich (see point 1)

6. It doesn't need the State (i.e. violent to redistribute wealth. It redistributes wealth organically, via the free market, from high time preference degenerate gamblers, rent-seekers and speculators to low time preference savers, producers, innovators and capital accumulators (the State by its nature punishes the latter and rewards the former)