Whether something is art or isn't is subject to many debates. Some believe art should express universal values, others value originality, uniqueness. Some think art is purely subjective, but many believe that it can roughly be judged objectively (which is how the value and recognition of some work over other is possible).
Bitcoin isn't subjective to me. In fact, it's all about verifiable things and consensus. There can be different purposes for Bitcoin, but they aren't limitless and largely fall into gambling, trading, hodling, using it as money.
As a person who teaches logic, I also can't help but point out a logical mistake in the last three sentences (if we take them together, as two premises and a conclusion). Even if Bitcoin is freedom and art is also freedom, that doesn't mean that Bitcoin is art. Simple example: apples are fruit, oranges are fruit, but apples aren't oranges.